On June 19, 1982, police informant Jorgenson informed Tyler that she had purchased some hashish from Olson in Kaz’s Bar at approximately 6:30 p.m. that evening. On the basis of this information, Tyler signed a criminal complaint against Olson. Following the signing of the complaint, the district attorney procured a warrant for Olson’s arrest from Judge Wallace Brady on August 4, 1982. Olson was arrested on August 6, 1982, after service of his Monroe County sentence, and held in the Juneau County jail until August 9, 1982, when he was released on a signature bond. At a preliminary hearing held on August 11, 1982, Jorgenson could not identify Olson as the person who had sold her the hashish at Kaz’s Bar, and the charges were dismissed.
Olson’s section 1983 suit against Tyler, Foster, and a number of other defendants, whose dismissal from this action is not challenged on appeal, claimed a violation of his fourth amendment right to be free from unreasonable seizures, a denial of equal protection,2 and a deprivation of liberty without due process of law. Olson alleged that Tyler and Foster knew or should have known that he was incarcerated in the Monroe County jail at the time he allegedly purchased hashish from the informant, and that therefore no probable cause existed for his arrest.3 Tyler and Foster dispute this allegation, but concede it for the purpose of appeal.
In its memorandum order the district court did not mention Olson’s fourth amendment claim at all, apparently viewing it as abandoned.4 The court based its grant of summary judgment entirely on Olson’s claim to have been deprived of liberty without due process. The court found that to the extent that this case can be distinguished from Baker v. McCollan, 443 U.S. 137, 99 S.Ct. 2689, 61 L.Ed.2d 433 (1979), because defendants were responsible for the mistaken identity, Parratt v. Taylor, 451 U.S. 527, 101 S.Ct. 1908, 68 L.Ed.2d 420 (1981), was dispositive. The availability of adequate state tort remedies for false arrest, false imprisonment, and malicious prosecution led the district court to conclude that Olson was not deprived of his liberty without due process of law.
II.
We believe that Olson intended to assert a claim that his arrest was unlawful under the fourth amendment, as made applicable to the states through the fourteenth amendment, and that he did not abandon or waive that claim. Consequently, we begin our analysis with the question whether the facts as alleged in the complaint would support such a claim.
An arrest is not unlawful merely because the information on which it was based is later determined to be inaccurate. McKinney v. George, 726 F.2d 1183, 1187 (7th Cir.1984). That defendants’ informant mistakenly identified Olson as the person from whom she purchased the hashish, standing alone, does not render the arrest illegal. But Olson has alleged, and defendants have conceded for the purpose of disposing of this appeal, that defendants knew or should have known that he was incarcerated at the time of the alleged drug trans
2
Olson’s equal protection claim, that he was dealt with arbitrarily, is not expounded on appeal. It is essentially a rephrasing of his fourth amendment claim. See McKinney v. George, 726 F.2d 1183, 1187 (7th Cir.1984).
3
Olson alleged that defendants Tyler and Foster were required to and did exchange information about persons under investigation for drug-related activities and that defendants were required to and did exchange information concerning Olson's whereabouts on June 19, 1982, the date he was alleged to have sold hashish to informant Jorgenson. Foster contends that he was not in any way involved in Olson’s arrest. Our opinion is not intended to foreclose Foster’s asserted defense.
4
In an earlier order granting judgment on the pleadings to a codefendant, the district court stated: