After he was arrested for the simple assault of his estranged wife, Ralph Holder brought this § 1983 action against the Town of Sandown, one Sandown police officer and the Sandown Chief of Police. In his complaint, Mr. Holder alleged, in addition to other claims not relevant to this appeal, that the officer had lacked probable cause to effect the arrest and therefore had violated his rights under the Fourth Amendment to the Constitution of the United States, as made applicable to the states through the Fourteenth Amendment. In due course, the defendants moved for summary judgment and, after a hearing, the district court granted the motion. Mr. Holder appeals, contending that the district court erred in concluding that the officer had probable cause for the arrest. For the reasons set forth in this opinion, we affirm the judgment of the district court.
I. BACKGROUND
A.
Because this case is before us on an appeal from the grant of summary judgment, we must take the facts in the light most favorable to the non-moving party, Mr. Holder, and must draw all reasonable inferences in his favor.
Crawford v. Metro. Gov’t of Nashville & Davidson County, Tenn.,
— U.S. -,
On October 4, 2003, Ralph Holder attended his son’s soccer game. His estranged wife, Maria, also was in attendance. When it began to rain, Mr. Holder approached his wife and asked her if she had a long-sleeved shirt for their son. When told that she did not, he asked if she could make sure that she had one next time. At this point, Ms. Holder yelled at Mr. Holder that he needed to “keep [his] black mouth shut,” R.10, Att. 5 at 1, and unexpectedly bumped him. Mr. Holder “instinctively” pushed her away. Id. Ms. Holder challenged him to a fight and said that he needed “to keep [his] hands off [her]” and called him a “black bastard.” R.20 ¶ 9; R.10, Att. 5 at 2. She then called the police.
Officer Jason Morrow was the first to arrive on the scene, and he spoke with Ms. Holder. She identified Mr. Holder and told the officer that he pushed her. Officer Morrow then went over and talked to Mr. Holder. While this discussion was taking place, Officer Derek Feather arrived.
Mr. Holder told Officer Morrow that Ms. Holder had initiated a verbal confrontation that had escalated to the point where she made contact with him before he pushed her back. 1 He also informed the officers that his estranged wife’s true objective was to obtain a restraining order to keep him from having contact with his son. Mr. Holder also told them that he and his estranged wife were involved in a bitter and protracted divorce and child *503 custody battle, and he urged the officers to speak with nearby witnesses.
Mr. Holder was arrested and charged with simple assault. 2 The determination of probable cause was made by Officer Morrow; Officer Feather merely assisted with the arrest. That assistance included providing his handcuffs for use in the arrest.
After the arrest, Officer Feather spoke with Ms. Holder and three witnesses. He received the impression that the witnesses did not want to get involved, but one of them did say that Ms. Holder had been verbally aggressive to Mr. Holder and, in the view of the witness, had precipitated the dispute. The other two witnesses seemed to agree. However, the witness who spoke with Officer Feather based his opinion only on what he had heard; he had not seen anything.
The case against Mr. Holder eventually was dismissed.
B.
In his complaint, Mr. Holder alleged, in addition to several supplemental state law claims, that the officers had lacked probable cause to effect the arrest, that the officers had discriminated against him on the basis of race and gender and that the officers had violated his due process rights by not interviewing witnesses and by not allowing him to conduct his own investigation. 3 The complaint named as defendants the Town of Sandown, Sandown’s then-Chief of Police, J. Scott Currier, Officer Morrow and Officer Feather. By the time Mr. Holder brought this action, however, Officer Morrow had left the Sandown Police Department; he never was served and therefore never became a defendant in this action.
The district court granted summary judgment for the defendants on the Fourth Amendment claim. The district court held that, as a matter of law, Mr. Holder’s constitutional right to be free from an unreasonable seizure had not been violated. With respect to Officer Feather, moreover, the court determined that, because he had played no role in effecting the arrest, there was no basis for any liability. With respect to the Town, the court determined that there was no evidence of a policy, custom or inadequate hiring and training practices that could constitute the basis of liability. Similarly, with respect to the Chief of Police, the court held there was no evidence that he had encouraged, condoned or acquiesced in any illegal arrest. Failure to take action against the officers after the fact was not sufficient to expose him to liability.
The court also granted summary judgment on the remaining federal claims and dismissed the state claims without prejudice. Mr. Holder now appeals the district *504 court’s ruling with respect to whether there was probable cause to effect his arrest.
II. DISCUSSION
A.
An arrest is lawful if the officer has “probable cause.”
Tennessee v. Garner,
The question of probable cause, like the question of reasonable suspicion, is an objective inquiry.
See Bolton v. Taylor,
Mr. Holder claims that “there are multitudinous material factual disputes.” Appellant’s Br. at 11. He does not, however, further explain the disputes. His lack of specificity on this point could well constitute waiver.
See King v. Town of Hanover,
B.
Mr. Holder further contends, however, that he instinctively shoved his wife backward only in response to her initial assault against him. Accordingly, he contends that he had a viable defense against her allegation. Mr. Holder submits that, when an officer has knowledge of a “bad relationship” between the person under suspicion and a witness to the alleged crime, that witness’s credibility must be considered questionable, and, consequently, the officer has a duty to investigate further before making an arrest.
In reliance on Supreme Court precedent, we already have rejected the proposition that a police officer has a standing obligation to investigate potential defenses or resolve conflicting accounts prior to making an arrest.
Id.
at 11 (citing
Baker v. McCollan,
We also have held that the general rule that an officer need not resolve possible defenses or conflicting accounts is qualified only in limited circumstances. In Acosta, we stated:
[W]e ... have disclaimed any unflagging duty on the part of law enforcement officers to investigate fully before making a probable cause determination. While we have recognized that such a duty may arise in highly idiosyncratic circumstances, we have made it clear that an officer normally may terminate [his] investigation when he accumulates facts that demonstrate sufficient probable cause.... The rule, then, applicable in the wide mine-run of cases, is that once a law enforcement officer unearths sufficient facts to establish probable cause, he has no constitutional duty either to explore the possibility that exculpatory evidence may exist or to conduct any further investigation in hope of finding such evidence.
Acosta,
Here, there was no reason, inherent in the situation, for Officer Morrow to believe that Ms. Holder had lied about being pushed by Mr. Holder. In many simple assault situations, there are bound to be accusations and recriminations based either on the immediate circumstances or the parties’ long-term relationship. To say that all such situations require an exception to the general rule would amount to an evisceration of the rule. Under the circumstances here, Officer Morrow did not fail “to investigate fundamental evidence at the crime scene.”
Romero v. Fay,
C.
As we have noted, Mr. Holder was charged with simple assault under New Hampshire statute 631:2-a. He also contends that another New Hampshire statute imposed a heightened standard of probable cause on the officers. That statute reads in pertinent part:
[A]n arrest for abuse may be made without a warrant upon probable cause, whether or not the abuse is committed in the presence of the peace officer. When the peace officer has probable cause to believe that the persons are committing or have committed abuse against each other, the officer need not arrest both persons, but should arrest the person the officer believes to be the primary physical aggressor. In determining who is the primary physical aggressor, an officer shall consider the intent of this chapter to protect the victims of domestic violence, the relative degree of injury or fear inflicted on the persons involved, and any history of domestic abuse between these persons if that history can reasonably be obtained by the officer.
*507 N.H.Rev.Stat. Ann. § 173-B:10, II. Mr. Holder contends that the officers ignored state law that required them to identify the instigator and aggressor. He does not, however, provide any additional argument on this point, and we might well be justified in deeming the matter waived for failure to develop a reasoned argument. Nevertheless, because the defendants have addressed the argument, we shall give Mr. Holder the benefit of the doubt and address the merits of his contention.
The Supreme Court has made it clear that, even if we were to consider this state-imposed requirement as part of a state-imposed probable cause inquiry, we should not regard it as part of the federal requirement for probable cause. Rather, it is a distinct state-imposed requirement that simply is not cognizable in an action to vindicate the federal right against unreasonable seizures protected by the Fourth Amendment. In
Virginia v. Moore,
We have relied on
Moore
to hold that when a prisoner’s conversation with his attorney was recorded in violation of a state regulation, that violation of state law did not operate to nullify, for purposes of Fourth Amendment analysis, the client’s consent to the recording.
United States v. Novak,
III. CONCLUSION
From the foregoing analysis, we must conclude that, at the time he arrested Mr. Holder, the officer had sufficient information to conclude that the state offense of simple assault had taken place. Consequently, there was no violation of the Fourth Amendment, and the district court properly granted summary judgment on that claim. Moreover, because there was no Fourth Amendment violation, we need not discuss independently the issues of qualified immunity, supervisory liability or municipal liability.
For these reasons, the judgment of the district court is affirmed.
Affirmed.
Notes
. Mr. Holder’s statement and affidavit do not establish with perfect clarity that he admitted to Officer Morrow that he had pushed Ms. Holder, and the record does not contain an affidavit from Officer Morrow. However, at the summary judgment hearing, Mr. Holder’s counsel conceded that Mr. Holder had told Officer Morrow that he pushed Ms. Holder after she pushed him.
. New Hampshire defines simple assault as follows:
631:2-a Simple Assault.
I. A person is guilty of simple assault if he:
(a) Purposely or knowingly causes bodily injury or unprivileged physical contact to another; or
(b) Recklessly causes bodily injury to another; or
(c) Negligently causes bodily injury to another by means of a deadly weapon.
II. Simple assault is a misdemeanor unless committed in a fight entered into by mutual consent, in which case it is a violation.
See also In re Nathan L.,
. Mr. Holder’s complaint made reference to the Sixth Amendment right to compulsory process and notice about the nature and cause of the accusation against him, R.l at 18, but, when asked by the district court to clarify the bases of his federal claims, Mr. Holder’s counsel made no reference to the Sixth Amendment. R.29at2-5. In any case, such a claim is not before us in this appeal.
. Mr. Holder’s reliance on several cases from other circuits is unavailing. In
Hebron v. Touhy,
. The Supreme Court also observed that "linking Fourth Amendment protections to state law would cause them to 'vary from place to place and from time to time.’ ”
Virginia v. Moore,
.
See also United States v. Humbert,
