NONPRECEDENTIAL DISPOSITION
                       To be cited only in accordance with
                               Fed. R. App. P. 32.1




           United States Court of Appeals
                             For the Seventh Circuit
                             Chicago, Illinois 60604

                              Submitted May 10, 2007*
                               Decided May 10, 2007

                                       Before

                  Hon. JOHN L. COFFEY, Circuit Judge

                  Hon. JOEL M. FLAUM, Circuit Judge

                  Hon. ANN CLAIRE WILLIAMS, Circuit Judge

No. 06-4149

ROBERT DALE LAMON,                           Appeal from the United States District
    Plaintiff-Appellant,                     Court for the Southern District of
                                             Illinois
      v.
                                             No. 05-CV-745-WDS
DONALD E. SANDIDGE, et al.,
    Defendants-Appellees.                    William D. Stiehl,
                                             Judge.

                                     ORDER

       Robert Lamon, a property owner and businessman in Alton, Illinois, brought
this civil rights lawsuit against the City of Alton, its mayor, and its police
department after he was arrested for operating a business without a license. In a
very short (less than two pages) complaint, Lamon alleged that Mayor David
Sandidge knowingly allowed Alton police to arrest him without probable cause. The


      *
        Appellees notified this court that they were never served with process in the
district court and consequently have not filed a brief in this appeal. After
examining the appellant’s brief and the record, we have concluded that oral
argument is unnecessary. Accordingly, the appeal is submitted on the appellant’s
brief and the record. See Fed. R. App. P. 34(a)(2).
No. 06-4149                                                                      Page 2

arrest followed repeated but unspecified “harassment” by unnamed people under
Sandidge’s control. These actions resulted in harm to Lamon’s business and
reputation. The district court dismissed the complaint sua sponte for failure to
state a claim, see Fed. R. Civ. P. 12(b)(6), and denied Lamon’s motion to reconsider.
Lamon timely appealed. We vacate in part and remand.

       The substantive law is well established. To state a claim under 42 U.S.C.
§ 1983, a plaintiff must allege that government officials, acting under color of state
law, deprived him of a constitutional right. Christensen v. County of Boone, __ F.3d
__, No. 04-4162, 

, at *3 (7th Cir. Mar. 21, 2007). An arrest without
probable cause is a violation of the Fourth Amendment. Driebel v. City of
Milwaukee, 

, 652 (7th Cir. 2002) (collecting cases). Municipalities and
local officials sued in their official capacities may be liable under § 1983 if a
municipal policy caused the constitutional injury. Monell v. Dep’t of Soc. Servs., 

, 694 (1978); Pourghoraishi v. Flying J, Inc., 

, 765 (7th Cir.
2006). And “a single act or decision of a final policymaker can establish municipal
policy.” Baxter v. Vigo County Sch. Corp., 

, 735 (7th Cir. 1994)
(superceded by statute on unrelated point); see Pembaur v. City of Cincinnati, 

, 481 (1986). Procedurally, a complaint is sufficient if it gives notice of the
plaintiff’s claims, Simpson v. Nickel, 

, 305-06 (7th Cir. 2006), and
cannot be dismissed for failure to state a claim unless it appears beyond doubt that
“the plaintiff can prove no set of facts that would entitle him to relief,” Savory v.
Lyons, 

, 670 (7th Cir. 2006) (internal quotation and citation omitted).

        Although Lamon’s brief to this court is deficient, see Fed. R. App. P. 28(a)(9),
it is plain from his complaint that he has stated one claim against the Mayor and
City of Alton: Mayor Sandidge, who we may reasonably assume is the final
policymaker for Alton, knowingly authorized the police to arrest Lamon without
probable cause. We must accept the truth of that allegation, however doubtful, at
this stage. See Christensen, 

at *1; 

(explaining that district court’s suspicion that plaintiff’s claim lacks merit is not
legitimate ground for dismissal); Loubser v. Thacker, 

, 441 (7th Cir.
2006). And the voluminous documents attached to the complaint do not foreclose
this claim because they do not contradict his allegations. See N. Ind. Gun &
Outdoor Shows, Inc. v. City of South Bend, 

, 454-55 (7th Cir. 1998).
For example, the booking sheet discloses merely that police arrested Lamon after
they “observed” him at an address where he had previously operated a business, but
it does not assert there was probable cause to believe he committed a crime. Thus it
was improper for the district court to dismiss at this juncture Lamon’s Fourth
Amendment claim that the Mayor (and, through him, the City of Alton) knowingly
authorized his arrest without probable cause.
No. 06-4149                                                                 Page 3

       The district court, however, properly dismissed the remainder of Lamon’s
claims—the unspecified harassment committed by unnamed people. Lamon has not
afforded the defendants reasonable notice of the nature of these claims or an
opportunity to begin their defense against them. See Fed. R. Civ. P. 8(a); 

. Furthermore, he has not explained them in his brief to this court
or timely asked for an opportunity to replead them.

                           VACATE in part and REMAND for further proceedings.