GARTZKE, P.J.
Joseph Griffin appeals from a judgment convicting him of possession of a firearm as a convicted felon. Sec. 941.29(2), Stats. Griffin was previously convicted of possession of heroin with intent to deliver, a felony, and was on probation for resisting arrest, disorderly conduct and obstructing an officer. Probation agents found a pistol in Griffin’s apartment during a warrantless search. The trial court denied Griffin’s motion to suppress the pistol as evidence.
Griffin contends that a warrant is constitutionally required to search a probationer’s residence. Alternatively, he argues that even without a warrant requirement the search was unlawful because it was not based upon probable cause, or, at a minimum, a reasonable belief that contraband was present. The state asserts that because Griffin was on probation, the warrantless search in accordance with the rules of the Department of Health and Social Services was constitutional. We conclude that probation agents could lawfully search Griffin’s apartment without a warrant on information from the [186]*186police that he had a gun in his apartment. We therefore affirm.
A probation supervisor testified at the suppression hearing that a detective in the Beloit police department telephoned him that the police had information that Griffin “may have had guns” in his apartment. The supervisor requested police protection for a search. Two or three hours later, the supervisor, a probation agent and three plainclothes police officers went to Griffin’s apartment. When Griffin answered the door, they identified themselves and said they were going to search the residence. The police stayed in the living room with Griffin, his child and a woman living with him, while the supervisor and agent searched the apartment. After the supervisor returned to the living room, an officer pointed to a partially open table drawer, in which the supervisor found the pistol. The supervisor directed the officers to arrest Griffin.
The trial court found that the police were present to protect the probation agents at the latters’ request and that a police search had not occurred. The court concluded that the warrantless search was reasonable because probation agents have a duty to determine whether a probationer is violating the law or the conditions of probation and because they relied on information from a detective that guns were or may be in Griffin’s apartment. The trial court therefore refused to suppress the gun as evidence. Griffin was tried and convicted, and this appeal resulted.
1. Warrantless Search by Probation Agents Permitted
Griffin’s motion to suppress is based on the fourth and fourteenth amendments to the United States Constitution[187]*1871 and Wis. Const, art. I, sec. 11. The provisions of the fourth amendment to the United States Constitution and Wis. Const, art. I, sec. 11, prohibit unreasonable search and seizure and are almost identical. Evidence obtained in violation of either provision is generally inadmissible and must be suppressed.
The chief evil against which the fourth amendment is directed is the physical entry of the home. Welsh v. Wisconsin, - U.S. -, - (1984), 80 L. Ed. 2d 732, 742.
And a principal protection against unnecessary intrusions into private dwellings is the warrant requirement imposed by the Fourth Amendment on agents of the government who seek to enter the home for purposes of search or arrest. See Johnson v. United States, 333 U.S. 10, 13-14 (1948). It is not surprising, therefore, that the Court has recognized, as “a ‘basic principle of Fourth Amendment law[,]’ that searches and seizures inside a home without a warrant are presumptively unreasonable.” Payton v. New York, 445 U.S. [573,] 586 [1980]. See Coolidge v. New Hampshire, 403 U.S. 443, 474-75 (1971) ....
Welsh, - U.S. at -, 80 L. Ed. 2d at 742 (footnote omitted).
Exceptions to the warrant requirement are “few in number and carefully delineated,” United States v. United States District Court, 407 U.S. 297, 318 (1972), and have been “jealously and carefully drawn.” Jones v. United States, 357 U.S. 493, 499 (1958). The exceptions recognized by the United States Supreme Court include search based on consent, search incident to a lawful arrest, a search in hot pursuit, exigent circumstances and seizure of evidence in plain view. See [188]*188Schneckloth v. Bustamonte, 412 U.S. 218, 219 (1973) (consent) ; Michigan v. Long, - U.S. -, -, 77 L. Ed. 2d 1201, 1219 (1983) (limited search incident to lawful arrest) ; Texas v. Brown, 460 U.S. 730, 735-36 (1983) (hot pursuit); New York v. Belton, 453 U.S. 454, 457 (1981) (exigent circumstances) ; and Washington v. Chrisman, 455 U.S. 1, 5-6 (1982) (plain view). The state makes no claim that any of these exceptions applies to the facts before us.
The United States Supreme Court has not declared whether the status of a probationer or parolee is a basis for an additional exception to the warrant requirement.2 This, of course, need not deter us from deciding whether the exception exists. See State v. Prober, 98 Wis. 2d 345, 360-61, 297 N.W.2d 1, 9 (1980) (medical emergency exception exists for warrantless search of home, notwithstanding lack of United States Supreme Court precedent). The existence and circumstances of such an exception have been the subject of considerable discussion at other levels. See 3 W. LaFave, Search and Seizure sec. 10.10, at 421 (1978). LaFave concludes: [189]*189the absence of probable cause or a search warrant or both.
[188]*188Although there is some authority to the effect that the Fourth Amendment rights of probationers and parolees are of precisely the same scope and dimension as those of the public at large, the weight of authority is to the contrary. . . . And while there is some disagreement as to whether a probationer’s Fourth Amendment rights are diminished to the same extent and degree as those of a parolee, there is considerable authority supporting the proposition that probationers may lawfully be subjected to searches which, absent their probation status, would be deemed unlawful because of
[189]*189Id. at 421-22 (footnotes omitted).
Most state and federal courts faced with the issue have held that probation or parole agents may conduct a warrantless search of the dwelling of a probationer or a parolee. -See, e.g., Latta v. Fitzharris, 521 F.2d 246, 250 (9th Cir.) (en banc), cert. denied, 423 U.S. 897 (1975); Owens v. Kelley, 681 F.2d 1362, 1368 (11th Cir. 1982); Roman v. State, 570 P.2d 1235, 1242 (Alaska 1977) (dicta); State v. Montgomery, 566 P.2d 1329, 1330 (Ariz. 1977); People v. Mason, 488 P.2d 630, 634 (Cal. 1971), cert. denied, 405 U.S. 1016 (1972); People v. Anderson, 536 P.2d 302, 305 (Colo. 1975); Grubbs v. State, 373 So. 2d 905, 907 (Fla. 1979) (use of evidence obtained limited to probation or parole revocation proceeding) ; State v. Fields, 686 P.2d 1379, 1389 (Hawaii 1984); State v. Malone, 403 So. 2d 1234, 1239 (La. 1981) (yard); People v. Richards, 256 N.W.2d 793, 795 (Ct. App. Mich. 1977); State v. Earnest, 293 N.W.2d 365, 369 (Minn. 1980) (evidence obtained used in a probation revocation proceeding); State v. Morgan, 295 N.W.2d 285, 289 (Neb. 1980) ; Himmage v. State, 496 P.2d 763, 766 (Nev. 1972) ; People v. Huntley, 371 N.E. 2d 794, 796 (N.Y. 1977) ; State v. Perbix, 331 N.W.2d 14, 21 (N.D. 1983); State v. Culbertson, 563 P.2d 1224, 1229 (Ct. App. Or. 1977) (dicta); State v. Cummings, 262 N.W.2d 56, 61 (S.D. 1978) ; State v. Velasquez, 672 P.2d 1254, 1260 (Utah 1983); State v. Simms, 516 P.2d 1088, 1094 (Ct. App. Wash. 1973).
Some courts permit police to make a warrantless search of a probationer’s or parolee’s dwelling. See, e.g., Owens v. Kelley, 681 F.2d at 1368; State v. Montgomery, 566 P.2d at 1331; People v. Mason, 488 P.2d at 631; People v. Richards, 256 N.W.2d at 795; State v. Morgan, 295 N.W.2d at 289; Seim v. State, 590 P.2d [190]*1901152, 1155 (Nev. 1979) (dicta); State v. Perbix, 331 N.W.2d at 21. Contra, e.g., U.S. v. Consuelo-Gonzalez, 521 F.2d 259, 266 (9th Cir. 1975) (en banc); Roman v. State, 570 P.2d at 1243; People v. Anderson, 536 P.2d at 305; Grubbs v. State, 373 So.2d at 909; State v. Fields, 686 P.2d at 1388; State v. Velasquez, 672 P.2d at 1262.
Under the minority view, no exception to the warrant requirement applies to probationers or parolees, and a warrantless search may not be made of such a person’s dwelling unless one of the judicially recognized exceptions is met. See, e.g., U.S. v. Rea, 678 F.2d 382, 387-88 (2d Cir. 1982) ; U.S. v. Bradley, 571 F.2d 787, 789 (4th Cir. 1978) ; State v. Cullison, 173 N.W.2d 533, 537 (Iowa), cert. denied, 398 U.S. 938 (1970) ; State v. Fogarty, 610 P.2d 140, 144 (Mont. 1980) ; Tamez v. State, 534 S.W.2d 686, 692 (Ct. App. Tex. 1976).
The Wisconsin Supreme Court recognizes an exception to the warrant requirement which allows probation agents to search or seize a probationer, provided that the search or seizure itself is reasonable. State v. Tarrell, 74 Wis. 2d 647, 654-55, 247 N.W.2d 696, 701 (1976). The Tarrell court reasoned as follows:
If there is to be an exception to the requirements of the fourth amendment granting probation agents a limited right to search or seize a probationer without a warrant, the foundation for this exception lies in the nature of probation itself. Probation, like parole, “is an integral part of the criminal justice system and has as its object the rehabilitation of those convicted of crime and the protection of the state and community interest.” State ex rel. Niederer v. Cady, 72 Wis. 2d 311, 322, 240 N.W.2d 626, 633 (1976). While probation is a privilege, not a matter of right, once it has been granted this conditional liberty can be forfeited only by breaching the conditions of probation. A sentencing judge may impose conditions which appear to be reasonable and appropriate. Sec. 973.09, Stats. A sentence of probation places the probationer “in the custody of the department” subject to the conditions of proba[191]*191tion and rules and regulations of the Department of Health & Social Services. Sec. 973.10. All conditions, rules and regulations must be imposed with the dual goal of rehabilitation of the probationer and protection of the public interest. The imposition of these conditions, rules and regulations demonstrates that while a probationer has a conditional liberty, this liberty is neither as broad nor as free from limitations as that of persons who have not committed a crime. The expectations of privacy of a person on probation cannot be the same as the expectations of privacy of persons not on probation. It is only the reasonable expectations of privacy which the fourth amendment protects. Conditions of probation must at times limit the constitutional freedoms of the probationer. Necessary infringements on these freedoms are permissible as long as they are not overly broad and are reasonably related to the person’s rehabilitation. By the very nature of probation, limitations on the liberty and privacy of probationers are imposed. These limitations are the bases for an exception to the warrant requirement of the fourth amendment.
Id. at 653-54, 247 N.W.2d at 700-701 (footnotes omitted).
Tarrell involved a personal search and seizure of a probationer, not the warrantless search of a probationer’s dwelling. Special considerations attend a home which do not apply to a search or seizure conducted elsewhere. “Cases involving searches for articles of personal property make clear that, under the fourth amendment, one’s home is entitled to special dignity and sanctity.” Laasch v. State, 84 Wis. 2d 587, 594, 267 N.W.2d 278, 282 (1978). Sanctity attends the home. Welsh v. Wisconsin, - U.S. -,- (1984), 80 L. Ed. 2d at 743; Payton v. New York, 445 U.S. at 588-89. Tarrell is not authority for the proposition that probation agents may search a probationer’s home without a warrant, in the absence of other circumstances which would permit the intrusion.
[192]*192The Tarrell opinion leads us to conclude, however, that a warrantless search of a probationer’s dwelling is permissible. The Tarrell court employed the reasoning of two lead opinions on the point: Latta v. Fitzharris, 521 F.2d 246 (9th Cir. 1975), and U.S. v. Consuelo-Gonzalez, 521 F.2d 259 (9th Cir. 1975). Tarrell, 74 Wis. 2d at 652 n. 1 (citing Consuelo-Gonzalez), 655 n. 5 (citing Latta), 247 N.W.2d at 700-01. The Latta court recognized that parolees possess fourth amendment protections but concluded that the relationship between the parole officer and the parolee precludes deciding the propriety of a warrantless search by automatic reference to the law of ordinary search and seizure. 521 F.2d at 250-51. The court held that a parole officer need not obtain a warrant before making an otherwise reasonable search of a parolee’s dwelling. Id. In U.S. v. Consuelo-Gonzalez, supra, the court applied the same rationale to the warrantless search of a probationer’s dwelling, emphasizing the dual goals of probation: rehabilitation of a convicted person and protection of the public. 521 F.2d at 264-66.3
[193]*193We reject Griffin’s argument that because innocent third persons were in his apartment, a warrant was necessary. Only one court, State v. Fogarty, 610 P.2d at 152, has so held. A second court, State v. Velasquez, 672 P.2d at 1260 n. 3, has said in dictum that caution would suggest that a warrant be obtained under those circumstances. In our view, because any search, with or without a warrant, can affect innocent third persons, no reason exists to require a warrant to protect the rights of those persons. See People v. Mason, 488 P.2d at 634.
We conclude that probation officers may conduct a warrantless search of a probationer’s dwelling, notwithstanding failure of the search to meet one of the usual exceptions to the warrant requirement, provided that the search is otherwise reasonable.
Griffin contends that the warrantless search of his apartment must be deemed to have been made by the police rather than probation agents. He treats the issue as one of law. He asserts that his conclusion is compelled because the police had foreknowledge of, acquiesced in, [194]*194and, in his view, actively participated in the search, and because the state seeks to use the evidence seized in a criminal prosecution. We reject his contention.
The trial court found that this was not a police search. That finding is tantamount to a factual inference from the established facts. The inference is that the search was made as part of the probation process rather than for law enforcement purposes. Treated as a factual inference, it is reasonable. We must accept the trial court’s reasonable factual inferences from the established facts. C.R. v. American Standard Ins. Co., 113 Wis. 2d 12, 15, 334 N.W.2d 121, 123 (Ct. App. 1983).
Other courts have held that the police may accompany a parole officer when a search is made. People v. Anderson, 536 P.2d at 305. As long as the predominant purpose is to determine whether probation has been violated, the search is valid. Seim v. State, 590 P.2d at 1155-56. The Latta court sustained a search by a parole officer accompanied by police, where the parole officer was not a “stalking horse” for the police. 521 F.2d at 247. The Consuelo-Gonzalez court recognized that a proper visitation by a probation officer did not cease to be so because he is accompanied by a law enforcement official unless the cooperation is a subterfuge for criminal investigation. 521 F.2d at 267. Compare Roman v. State, 570 P.2d at 1243 (right to search is limited to parole officers but includes peace officers acting under their direction) ; State v. Turner, 688 P.2d 1030, 1035 (Ct. App. Ariz. 1984) (search not invalid because of. police assistance); State v. Howard, 143 Cal. Rptr. 342, 343 (Ct. App. Cal. 1978) (police search at request of probation officer valid); State v. Simms, 516 P.2d at 1095 (parole officer may enlist aid of police officer in performing his duty); Sanderson v. State, 649 P.2d 677, 679 (Wyo. 1982) (police search at probation officer’s request held part of probation process).
[195]*195Nor is a warrantless search by a probation agent invalidated because the evidence seized is used in a criminal prosecution. “To hold that evidence obtained by a parole officer in the course of carrying out this duty cannot be utilized in a subsequent prosecution because evidence obtained directly by the police in such a manner would be excluded, would unduly immunize parolees from conviction.” United States ex rel. Santos v. New York State Bd. of Par., 441 F.2d 1216, 1218 (2d Cir. 1971), cert. denied, 404 U.S. 1025 (1972). See also, Latta v. Fitzharris, 521 F.2d at 252-53 (evidence seized in valid search by parole officer may be used in criminal prosecution) ; People v. Anderson, 536 P.2d at 305 (evidence is admissible in the prosecution of another crime); State v. Perbix, 331 N.W.2d at 22 (evidence seized in valid search for probation violation may be used in new criminal prosecution) ; State v. Velasquez, 672 P.2d at 1262-63 (that evidence seized is beneficial to police or is used in criminal prosecution does not invalidate warrantless search of parolee’s apartment).
2. Grounds for Warrantless Search of Probationer’s Dwelling — Compliance with Department Rules
The supervisor testified that the search was conducted under rules adopted by the Department of Health and Social Services. The pertinent rule is Wis. Adm. Code sec. HSS 328.21(4), which permits probation agents to search a probationer’s living quarters “if there are reasonable grounds to believe that the quarters . . . contain contraband.”4 Contraband includes any item [196]*196whose possession is forbidden by law. Wis. Adm. Code sec. HSS 328.16(1) (b). It is generally unlawful for a convicted felon to possess a firearm. Sec. 941.29(2), Stats.
[197]*197An administrative agency is bound by its regulations. Vitarelli v. Seaton, 359 U.S. 535, 539-40 (1959). Consequently, the search cannot be valid unless the probation agents had “reasonable grounds to believe” that Griffin’s apartment contained contraband. Wis. Adm. Code sec. HSS 328.21(4). Only if this standard is met need we examine whether the search is otherwise reasonable.
In the law of arrest, reasonable grounds is equated with probable cause. State v. Drogsvold, 104 Wis. 2d 247, 255, 311 N.W.2d 243, 247 (Ct. App. 1981). That is not the meaning of the standard in Wis. Adm. Code sec. HSS 328.21(4). The Note to HSS 328.21 states:
Although it is preferable to have searches and seizure conducted by law enforcement authorities, that may not [198]*198always be feasible or advisable, and it is deemed important to give field staff the authority to conduct reasonable searches at reasonable times. Experience teaches that these searches may be necessary because contraband, including drugs, and weapons, may be discovered during these searches. These searches are thought to deter the possession of contraband.
The contrast in the Note between police searches and staff searches shows that the reasonable grounds standard in HSS 328.21 is less than probable cause.
If, as here, the historical facts are undisputed or have been established, whether the agents had reasonable grounds to believe that Griffin’s apartment contained contraband is a question of law. Compare State v. Drogsvold, 104 Wis. 2d at 262, 311 N.W.2d at 250 (probable cause for arrest is a question of law if historical facts are undisputed). We decide questions of law without deference to the trial court’s conclusion.
Griffin contends that the probation supervisor lacked reasonable cause because he testified at the evidentiary hearing that an unnamed police officer had said that defendant "may have had guns” in his residence. To rely on that indefinite statement is unreasonable in Griffin’s view.
The trial record shows that the supervisor had definite information that Griffin had a gun in his apartment. When reviewing an order on a motion to suppress evidence, an appellate court may take into account the evidence at the trial, as well as the evidence at the suppression hearing. Carroll v. U.S., 267 U.S. 132, 162 (1925) ; U.S. v. Canieso, 470 F.2d 1224, 1226 (2d Cir. 1972) ; U.S. v. Pearson, 448 F.2d 1207, 1210 (5th Cir. 1971) ; Rocha v. U.S., 387 F.2d 1019, 1021 (9th Cir. 1967), cert. denied, 390 U.S. 1004 (1968) ; U.S. v. Smith, 527 F.2d 692, 694 (10th Cir 1975). At the trial, the supervisor testified that the detective who called him [199]*199said “they had information that Mr. Griffin had [a gun] in his possession at his residence.”
Griffin argues that to have reasonable cause, the supervisor needed more than the detective’s statement that a gun was in Griffin’s apartment. He asserts that we should apply the “totality of circumstances” analysis in Illinois v. Gates, 462 U.S. 213 (1983). Our state supreme court used that test when determining whether a reasonable person would have believed that an emergency existed which created a need for aid. State v. Boggess, 115 Wis. 2d 443, 455, 340 N.W.2d 516, 523 (1983).
We will not apply the “totality of circumstances” analysis created in Illinois v. Gates, supra. That analysis is used to determine whether a magistrate may conclude that probable cause exists to issue a warrant. We deal with the lesser standard of reasonable cause for a warrantless entry. The Boggess court dealt with a warrantless entry by a social worker and police officers for the safety and welfare of children. We deal with entry of the home of a person who is not entitled to the protection of a warrant and with a search required by the needs of probation.
Wisconsin Adm. Code sec. HSS 328.21(7) directs that a probation agent consider “[t]he need to verify compliance with rules of supervision and state and federal law” when determining whether reasonable grounds exist to believe that a client’s living quarters contain contraband. That need is extremely high when the agent believes that a firearm is in a probationer’s home. As stated in the Note to sec. HSS 328.21:
Contraband, particularly weapons, may be used to threaten, injure, or kill another. That weapons be kept out of the hands of clients is critical for the safety of others. Contraband must also be kept out of the hands of clients so they may be better able to participate in [200]*200jobs, schooling or training, and other programs effectively.
We hold that a probation officer has reasonable grounds to believe that a probationer’s living quarters contain contraband when told by the police that the quarters contain a gun. The search therefore met the requirements of the administrative regulation under which it was conducted, Wis. Adm. Code sec. HSS 328.21 (4).
3. “Reasonable Grounds to Believe” Sufficient for Warrantless Search
Other courts which permit a warrantless search of a probationer’s dwelling also. hold that the search may be constitutionally made on less than probable cause to believe that a probation violation has occurred. Those courts variously describe the appropriate standard. See, e.g., Latta v. Fitzharris, 521 F.2d at 250 (reasonable belief that search is necessary but parole officer’s “hunch” said to be sufficient); People v. Anderson, 536 P.2d at 305 (reasonable grounds); State v. Fields, 686 P.2d at 1390 (reasonable suspicion supportable by specific and articulable facts); State v. Malone, 403 So.2d at 1239 (reasonable suspicion) ; State v. Williams, 486 S.W.2d 468, 473 (Mo. 1972) (sufficient information to arouse suspicion) ; State v. Culbertson, 563 P.2d at 1229 (minimal information or even spot checking as dictated by experience); State v. Velasquez, 672 P.2d at 1260 (reasonable suspicion); State v. Simms, 516 P.2d at 1096 (well-founded suspicion).
Some courts allow a warrantless search of a probationer’s dwelling even if no grounds exist to believe that a probation violation has occurred. The eleventh circuit finds no constitutional requirement even of rea[201]*201sonable suspicion, if the search is performed in a reasonable manner. Owens v. Kelley, 681 F.2d at 1368-69. See also People v. Mason, 488 P.2d at 634 (probationer held to have consented to condition permitting searches whenever requested by police officers); State v. Morgan, 295 N.W.2d at 286 (condition authorizing search “with or without probable cause” held valid); State v. Perbix, 331 N.W.2d at 21 (searches permitted without, reasonable suspicion).
The “reasonable grounds to believe” standard in Wis. Adm. Code sec. HSS 328.21 (4) is, however, the minimum we should consider. It binds probation agents in this state. Because the Department of Health and Social Services must abide by its own regulations, we need not decide whether a lesser standard is acceptable.
The many decisions we have already cited show that a “reasonable” standard or one comparable to it has been held to be constitutionally acceptable. The reasonable standard adopted by the department should adequately protect probationer from intrusions of their dwellings without grounds and from harassment by probation agents. We approve it.
4. Reasonableness of Search Itself
The time, manner and scope of the search are not challenged on appeal and we therefore do not reach the reasonableness of the search itself. Any warrantless search conducted in furtherance of the purposes of probation must, of course, be carried out in reasonable manner, Owens v. Kelley, 581 F.2d at 1368-69; Latta v. Fitzharris, 521 F.2d at 252.
[202]*202Because we conclude that the search was valid under the fourth amendment, we affirm the judgment appealed from.
By the Court. — Judgment affirmed.