J. SKELLY WRIGHT, Circuit Judge:
The pesticide DDT has been one of the most widely used chemicals to control various insect populations and to protect agricultural crops from destruction by insects. Recent seientife studies have, however, raised serious questions about the effect on the environment and on human health of the continued use of DDT. Some experiments have demonstrated that DDT increased the incidence of cancer in mice, and a recent Government commission on pesticides concluded that “[t]he evidence for the carcinogenicity of DDT in experimental animals is impressive.”
On the basis of these recent studies, petitioners
here filed a petition with the Secretary of Health, Education and. Welfare, under applicable statutory provisions,
proposing that the Secretary es
tablish a “zero tolerance” for DDT residues in or on raw agricultural commodities. The Secretary rejected the petition as legally insufficient since petitioners had not shown any “practicable method” of removing the residues of the persistent pesticide DDT from raw agricultural commodities. Consequently, he refused to publish petitioners’ proposal in the Federal Register, an action which would have triggered a series of informal and formal administrative procedures, including study of the proposal by a specially appointed committee of scientists and formal administrative hearings open to all interested parties.
In this court, petitioners urge that the Secretary’s order refusing to publish their proposal should be reversed on two grounds. First, they argue that their petition, properly interpreted, met all the statutory requirements, including that of “practicability.” Second, they urge that the 1958 amendment to the Food, Drug and Cosmetic Act, which requires the Secretary to ban any food additive which is found to induce cancer in experimental animals (the Delaney amendment),
must be read to require the Secretary not merely to publish their proposal but to establish the “zero tolerance” forthwith.
I
At the outset, we reject respondents’ position that any action by HEW on petitioners’ proposal must await action, in the first instance, by the Department of Agriculture. The federal government regulates the use of pesticides through two statutes, the Food, Drug and Cosmetic Act
(FDCA), administered by the Secretary of HEW, and the Federal Insecticide, Fungicide and Rodenticide Act
(FIFRA), administered by the Secretary of Agriculture.
FIFRA regulates the shipment of pesticides, called “economic poisons,” in interstate commerce. Under the provisions of that Act, every economic poison marketed in interstate commerce must be registered. To be registered, an economic poison must meet certain requirements relating to labeling, agricultural usefulness, and safety. These requirements apply to all pesticides, whether or not used on food crops. FDCA regulates pesticides only to the extent of controlling the residue of a pesticide which can safely remain in or on raw agricultural commodities. The Act first prohibits shipments' in interstate commerce of “adulterated” crops.'" 21 U.S.C. § 331. Raw agricultural commodities are considered “adulterated” if there are residues of pesticide chemicals in or on them. 21 U.S.C. § 342(a) (1). However, the Secretary of HEW is authorized to establish maximum permissible amounts, called tolerances, for pesticide residues; if the pesticide residue is below the tolerance, the commodity is not considered “ádulterated.” 21 U.S.C. § 346a.
The heart of the regulatory scheme lies in the establishment of these tolerances. Without detailing the elaborate procedures involved, we note that the Act provides two general commands to the Secretary of HEW in establishing tolerances. First, the Act directs the Secretary of HEW to establish tolerances “to the extent necessary to protect the public health.” 21 U.S.C. § 346a(b). In making this judgment, the Secretary is required by the Act to consider the necessity for an adequate food supply, other ways in which the consumer might be affected by the same pesticide, and the opinion of the Secretary of Agriculture as to the agricultural usefulness of the pesticide involved.
Ibid.
Second, the general instruction to establish tolerances is modified by the authorization to establish a zero tolerance — a ban on any residue at all — “if the scientific data before the Secretary does not justify the establishment of a greater tolerance.”
Ibid.
In the words of both Senate and House Reports on this legislation:
“Before any pesticide-chemical residue may remain in or on a raw agri
cultural commodity, scientific data must be presented to show that the pesticide-chemical residue is safe from the standpoint of the food consumer. The burden is on the person proposing the tolerance or exemption to establish the safety of such pesticide-chemical residue.”
While it is obvious that the responsibilities of the two Secretaries are interrelated and ought to be coordinated, we think their individual responsibilities are quite clear and quite separate. The Secretary of HEW is given the primary responsibility for determining the amount of residue of a pesticide which can safely — from the viewpoint of the food consumer — be left on raw agricultural commodities. It is true that in establishing a tolerance the Secretary of HEW must take into account the Agriculture Secretary’s opinion regarding the agricultural usefulness of the pesticide, but that is only one of many factors which HEW must consider. In our judgment, the Act’s language requires that HEW make its own independent judgment, based on public health considerations, as to the tolerance which should be set for pesticide residues on raw agricultural commodities and not abdicate its responsibility to the Department of Agriculture.
The legislative history supports this conclusion and makes clear beyond peradventure that Congress intended to lodge primary responsibility for public health considerations with the Secretary of HEW. The present pesticide provisions of the FDCA were added by amendment in 1954. The reports of both Houses of Congress on the- 1954 amendments stressed that one of the main goals of that legislation was to define clearly departmental responsibilities:
“The principal respects in which this bill would change and improve existing law are—
“2.
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J. SKELLY WRIGHT, Circuit Judge:
The pesticide DDT has been one of the most widely used chemicals to control various insect populations and to protect agricultural crops from destruction by insects. Recent seientife studies have, however, raised serious questions about the effect on the environment and on human health of the continued use of DDT. Some experiments have demonstrated that DDT increased the incidence of cancer in mice, and a recent Government commission on pesticides concluded that “[t]he evidence for the carcinogenicity of DDT in experimental animals is impressive.”
On the basis of these recent studies, petitioners
here filed a petition with the Secretary of Health, Education and. Welfare, under applicable statutory provisions,
proposing that the Secretary es
tablish a “zero tolerance” for DDT residues in or on raw agricultural commodities. The Secretary rejected the petition as legally insufficient since petitioners had not shown any “practicable method” of removing the residues of the persistent pesticide DDT from raw agricultural commodities. Consequently, he refused to publish petitioners’ proposal in the Federal Register, an action which would have triggered a series of informal and formal administrative procedures, including study of the proposal by a specially appointed committee of scientists and formal administrative hearings open to all interested parties.
In this court, petitioners urge that the Secretary’s order refusing to publish their proposal should be reversed on two grounds. First, they argue that their petition, properly interpreted, met all the statutory requirements, including that of “practicability.” Second, they urge that the 1958 amendment to the Food, Drug and Cosmetic Act, which requires the Secretary to ban any food additive which is found to induce cancer in experimental animals (the Delaney amendment),
must be read to require the Secretary not merely to publish their proposal but to establish the “zero tolerance” forthwith.
I
At the outset, we reject respondents’ position that any action by HEW on petitioners’ proposal must await action, in the first instance, by the Department of Agriculture. The federal government regulates the use of pesticides through two statutes, the Food, Drug and Cosmetic Act
(FDCA), administered by the Secretary of HEW, and the Federal Insecticide, Fungicide and Rodenticide Act
(FIFRA), administered by the Secretary of Agriculture.
FIFRA regulates the shipment of pesticides, called “economic poisons,” in interstate commerce. Under the provisions of that Act, every economic poison marketed in interstate commerce must be registered. To be registered, an economic poison must meet certain requirements relating to labeling, agricultural usefulness, and safety. These requirements apply to all pesticides, whether or not used on food crops. FDCA regulates pesticides only to the extent of controlling the residue of a pesticide which can safely remain in or on raw agricultural commodities. The Act first prohibits shipments' in interstate commerce of “adulterated” crops.'" 21 U.S.C. § 331. Raw agricultural commodities are considered “adulterated” if there are residues of pesticide chemicals in or on them. 21 U.S.C. § 342(a) (1). However, the Secretary of HEW is authorized to establish maximum permissible amounts, called tolerances, for pesticide residues; if the pesticide residue is below the tolerance, the commodity is not considered “ádulterated.” 21 U.S.C. § 346a.
The heart of the regulatory scheme lies in the establishment of these tolerances. Without detailing the elaborate procedures involved, we note that the Act provides two general commands to the Secretary of HEW in establishing tolerances. First, the Act directs the Secretary of HEW to establish tolerances “to the extent necessary to protect the public health.” 21 U.S.C. § 346a(b). In making this judgment, the Secretary is required by the Act to consider the necessity for an adequate food supply, other ways in which the consumer might be affected by the same pesticide, and the opinion of the Secretary of Agriculture as to the agricultural usefulness of the pesticide involved.
Ibid.
Second, the general instruction to establish tolerances is modified by the authorization to establish a zero tolerance — a ban on any residue at all — “if the scientific data before the Secretary does not justify the establishment of a greater tolerance.”
Ibid.
In the words of both Senate and House Reports on this legislation:
“Before any pesticide-chemical residue may remain in or on a raw agri
cultural commodity, scientific data must be presented to show that the pesticide-chemical residue is safe from the standpoint of the food consumer. The burden is on the person proposing the tolerance or exemption to establish the safety of such pesticide-chemical residue.”
While it is obvious that the responsibilities of the two Secretaries are interrelated and ought to be coordinated, we think their individual responsibilities are quite clear and quite separate. The Secretary of HEW is given the primary responsibility for determining the amount of residue of a pesticide which can safely — from the viewpoint of the food consumer — be left on raw agricultural commodities. It is true that in establishing a tolerance the Secretary of HEW must take into account the Agriculture Secretary’s opinion regarding the agricultural usefulness of the pesticide, but that is only one of many factors which HEW must consider. In our judgment, the Act’s language requires that HEW make its own independent judgment, based on public health considerations, as to the tolerance which should be set for pesticide residues on raw agricultural commodities and not abdicate its responsibility to the Department of Agriculture.
The legislative history supports this conclusion and makes clear beyond peradventure that Congress intended to lodge primary responsibility for public health considerations with the Secretary of HEW. The present pesticide provisions of the FDCA were added by amendment in 1954. The reports of both Houses of Congress on the- 1954 amendments stressed that one of the main goals of that legislation was to define clearly departmental responsibilities:
“The principal respects in which this bill would change and improve existing law are—
“2. The determination of questions of agricultural usefulness and probable residue levels involved in the establishment of tolerances, is made a function of the Department of Agriculture; while the determination of questions of a public health nature remains a function of the Department of Health, Education, and Welfare. * * - ”
If Congress intended that either department defer to the other, the House and Senate reports suggest that ordinarily Agriculture’s decisions as to whether to register a pesticide under FIFRA for use on food crops should depend upon HEW’s decision to grant a tolerance.
Respondents suggest, however, that the problem posed by DDT’s “persistence” somehow alters these basic responsibilities. They argue that, as a result of DDT’s persistence, DDT remains in the air, water and soil for a sufficient length of time to be carried over from season to season and from one crop to another. As a result, according to this argument, DDT must first be deregistered by Agriculture, and the chemical allowed to gradually disappear, before HEW can reasonably enact zero tolerances. We note in passing that this argument would apparently mean that HEW would
never
have to act since, according to the argument’s premise, DDT would have disappeared.
But, in any event, we do not see how the fact that there is a new, and quite difficult, dimension present in any decision to revise present DDT tolerances operates to relieve HEW of its statutory responsibility. ' DDT’s persistence will obviously affect any action taken by HEW; in all probability it will require that agency to bring creativity and imagination to bear in the search for a workable solution to .the problem. But HEW’s present posture would require the Department of Agriculture to weigh all the public health concerns which Congress intended that HEW assess.
One of the strengths of administrative agencies has always been thought to be the expertise which reposes in specialized administrators.
Presumably that was one of the reasons Congress thought it wise to divide responsibilities for different aspects of pesticide regulation between the Departments of Agriculture and HEW: each has a particular specialty and focus. For either department to relinquish its responsibility would destroy the regulatory scheme enacted by Congress. Consequently, we believe that HEW had and continues to have a responsibility to appraise the continuing safety of pesticide tolerance levels; it should, of course, continue to coordinate its operations with the Department of Agriculture, as it presently does. But it may not relinquish or evade its own responsibilities.
II
The Commissioner of Food and Drugs, acting as the delegate of the Secretary of HEW, rejected petitioners’ petition on the ground that it did not satisfy Section 408(d) (1) (E) of the FDCA, 21 U.S.C. § 346a(d) (1) (E), which requires data showing “practicable methods for removing residue which exceeds any proposed tolerance.”
This alleged defi
ciency also derives from the fact that DDT is a “persistent” pesticide,
i. e.,
it does not decay quickly, but remains in its toxic form in the environment (and increasingly in human bodies) for a period of years. Thus even if all applications of DDT were to cease tomorrow, substantial and detectable residues of DDT would apparently continue to exist in many raw agricultural commodities. Under these circumstances, establishing a zero tolerance for DDT on all commodities, effective immediately, would mean that a substantial proportion of food in the United States would still be “adulterated” within the meaning of the FDCA.
In their supplement to their petition, however, petitioners made clear that they were not seeking this infeasible, major disruption of the country’s food supply. Specifically, they suggested:
“ * * * At a minimum, the Secretary should establish a zero tolerance for DDT and its residues on all raw agricultural commodities with the possible exemption from seizure of any commodities in which it can be established that any residues are the consequence of applications of DDT that were made prior to the announcement by the Secretary of the zero tolerance.”
This is certainly one possible solution leading to the gradual elimination of a persistent pesticide from the environment.
In any event, we think HEW’s emphasis on the “practicability” requirement is seriously misplaced, as disclosed by the most cursory examination of the legislative history of the provision. Both House and Senate reports emphasize that the formal requirements for a petition are to be flexibly administered in the interest of safeguarding the public health:
“It is intended that a rule of reason should dictate the nature and extent of the information which should be submitted with a petition. What is contemplated is data adequate to permit an accurate appraisal of safety to protect the public health. In this respect the data as to a particular chemical will depend upon many variable factors, including its physical and chemical properties, recommended purpose, toxicity, and rate of disappearance. The emphasis to be placed on any such factor will similarly depend on the particular pesticide chemical under consideration and its proposed usage. * * * ”
In our judgment, the Commissioner of Food and Drugs failed to apply a “rule of reason” in assessing'the present petition. Instead of publishing petitioners’ proposal, which would begin an administrative process designed to bring forth constructive alternatives for dealing with an admittedly difficult but vitally important problem, the Commissioner chose to stop petitioners at the door. Moreover, he chose to rely on a requirement which cannot be applied literally to the present case. Everyone agrees that there is no way to remove DDT from the environment
immediately.
The questions to be answered are how great is the present danger and what steps ought to be taken immediately in response to that danger.
These are basically matters for exploration and judgment which in the last analysis will rest with HEW. But there
was no further information or data regarding these matters which HEW could reasonably seek to have petitioners produce. They have already submitted “data adequate to permit an accurate appraisal of safety to protect the public health.” What remains to be developed are reasonable approaches to the problem. Petitioners in fact endeavored to suggest one —a zero tolerance with exemptions for residues attributable to DDT applications made before the establishment of the tolerance. Another approach, suggested by the Secretary’s Commission on Pesticides and Their Relationship to Environmental Health and quoted in respondents’ brief, is to announce immediately a gradual stepwise reduction of permissible residue levels to be effective on a prospective basis.
Yet another approach might be to announce a zero tolerance level to be effective at some time in the future.
Moreover, it is clear from the present regulations .that the effect of the present level of environmental contamination does not affect all foods similarly, since there are, at present, different levels of DDT tolerances for different commodities.
Therefore, it may also be possible to deal differently with different categories of foodstuffs.
None of these alternatives has been considered in specific detail, with opportunity for comment and study by all interested parties. The administrative process, the process which Congress intended to focus on and illuminate these problems, has not been permitted to begin. In our view, the petition does comply with all statutory prerequisites, and this ease must, therefore, be remanded to the Secretary of HEW with directions to file petitioners’ proposal and to publish it in the Federal Register, as provided in 21 U.S.C. § 346a(d) (1).
III
Petitioners here argue that any remand order should not permit the Secretary to consider “whether it is appropriate to continue, for any period of time, using DDT; rather, the Secretary should consider only the solution that should be implemented to afford the consuming public the greatest possible protection from continued exposure to that cancer-producing poison.” Petitioners contend that this result is compelled by 21 U.S.C. § 348(c) (3) (A), the so-called Delaney amendment, which requires the Secretary to ban any
food additive
which has been found to cause cancer in experimental animals.
Since we have decided that a remand is necessary, we think it appropriate . to indicate our views on this question.
Several related events which occurred in the late 1950’s form the basis for petitioners’ argument that the Delaney amendment, or at least the principle it embodies, applies to pesticide chemicals. Just prior to Thanksgiving 1959, HEW seized substantial proportions of that year’s cranberry crop because the cranberries contained residues of the weed killer pesticide aminotriazole. In announcing the legal basis for the Department’s action, then Secretary of HEW Arthur Flemming took the following position :
“ * * * Research has established the fact that the weed killer, aminotriazole, causes cancer in the thyroid of rats when it is contained in their diet.
“It is the Department’s position that because such a chemical is unsafe, we cannot issue a regulation setting a tolerance for it when it causes cancer in man or animal. * * *
“This policy is basic in our food and drug law, and it was spelled out in the
law itself when Congress recently passed the Food Additives Amendment. This included the following provision:
“[Delaney Amendment set out]
“In endorsing this language, we told Congress this policy was already in force under the pesticide chemicals law without the above-quoted language.”
Shortly after the cranberry seizure, Secretary Flemming appeared before a congressional committee to testify in support of an extension of the Delaney amendment to the color additives portion of the FDCA.
(The original Delaney amendment applied to food additives.) In his testimony, Secretary Flemming emphasized that scientifically there was no way to determine a “safe” level for a substance known to produce cancer in animals.
Relying on this scientific finding, Flemming again told Congress that HEW would be required to apply the no-carcinogen policy even absent the explicit statutory command:
“According to advice of our scientists, the principle of the * * * anticancer (Delaney) proviso of the Food Additives Amendment reflects, basically, the current state of scientific knowledge, and we would therefore, except as noted below, feel constrained to apply the same principle even in the absence of this proviso,
and we do in fact apply it in the administration of the Pesticide Chemicals Amendment which does not contain the proviso."
While we agree that these events are not without legal significance, we do not think the Delaney anticancer amendment can be held to apply full force to pesticide chemicals. The Delaney clause was added, as we have noted, to the FDCA as part of the Food Additives Amendment of 1958 and reads, in pertinent part, as follows:
“ * * * [N] o additive shall be deemed to be safe if it is found to induce cancer when ingested by man or animal, or if it is found, after tests which are appropriate for the evaluation of the safety of
food additives,
to induce cancer in man or animal -X- * * * * *
"
Two years later, in 1960, Congress added a similar prohibition on color additives which were found to induce cancer in test animals. But in both instances the statute explicitly excludes pesticide chemicals from the definition of the terms “food additive”
and “color additive.”
This does not, however, end the matter. Rather, it means that the statutory standards to be applied are not the specific commands of the anticancer amendments, but- the general command contained in Section 408 of the FDCA, 21 U.S.C. § 346a.
Section 408 of the FDCA authorizes the Secretary of HEW to estab
lish tolerances for pesticide residues on or in raw agricultural commodities “to the extent necessary to protect the public health.” The section also authorizes the setting of a zero tolerance (no residue) level “if the scientific data before the Secretary does not justify the establishment of a greater tolerance.” We need not pause to plumb the obvious ambiguities in this language since both Senate and House Committee Reports make the intended meaning of this section indisputably clear:
“Before any pesticide-chemical residue may remain in or on a raw agricultural commodity, scientific data must be presented to show that the pesticide-chemical residue is safe from the standpoint of the food consumer. The burden is on the person proposing the tolerance or exemption to establish the safety of such pesticide-chemical residue.”
In this context, we think the events of the late 1950’s indicate administrative action entirely consistent with, if not required by, Congress’ expressed intent. At that time, Secretary Flemming indicated that there was no scientific basis for determining a “safe” residue level for a chemical known to produce cancer in experimental animals.
Under such conditions, it would obviously be impossible to meet the congressionally imposed burden of establishing the safety of a residue of such a pesticide. On remand, therefore, the Secretary must consider the scientific evidence presented and determine whether continued tolerances for DDT are consistent with the intent of Congress.
If the evidence demonstrates that DDT is a carcinogen and the Secretary proposes to continue in effect any DDT tolerances on raw agricultural commodities, he would, of .course, be required to explain the basis on which he determined such tolerances to be “safe.”
The petition for review is granted, the order of the Secretary of HEW is reversed, and the case is remanded with instructions to publish petitioners’ proposal in the Federal Register and commence the administrative process contemplated by the provisions of the Food, Drug and Cosmetic Act.
So ordered.