Missouri cops will need to get a search warrant before they can access data from your automobile’s black box.

A recent decision in the Western District of Missouri basically blocks law enforcement from obtaining your black box data after an accident, unless you either consent or they get a warrant.

The appellate court took up the case of a man that had been stopped at traffic and was struck by a semi from behind. The Missouri Highway Patrol then downloaded the data stored on the semi’s electronic control module (ECM). Officers did not use a warrant and argued that there were exigent circumstances, therefore, the semi driver had no expectation of privacy of the data. Up to then, obtaining the black box data had been standard procedure for the highway patrol.

The patrol officer claimed that the driver had given him consent, but that box had not been checked off in his police report. The appellate court relied on a recent US Supreme Court case on GPS spying to find the police arguments were insufficient.

Judge Cynthia L. Martin wrote: “Sergeant Meyers’s testimony underscores that ECM data was seized from West’s truck not because there was probable cause to believe that West had committed a crime and that evidence of the crime could be found in the truck, but instead to investigate an accident to determine whether West had committed a crime.”

The court added that to allow warrantless searches on these grounds would “emasculate” the Fourth Amendment to the constitution.

Here is an unofficial summary of the case and should not be used as legal doctrine:

(1) The State’s arguments on appeal asserting error in granting the motion to suppress which were not raised with the trial court are not preserved for appellate review.

(2) Either a reasonable expectation of privacy or trespass on a possessory interest in a Fourth Amendment protected effect will afford standing to assert a Fourth Amendment violation. Here, West was the lawful operator and possessor of the semitruck at the time the police physically intruded into the semi-truck’s passenger compartment to connect a computer to the ECM located underneath the semi-truck’s dash. That physical intrusion into, and occupation of, the semi-truck constituted an actionable trespass into a protected Fourth Amendment effect (a vehicle) which afforded West standing to move to suppress the data downloaded from the ECM.

(3) The automobile exception allows police to search a vehicle and seize
contraband found therein without a warrant if there is probable cause to believe that the vehicle contains contraband and exigent circumstances necessitate the search. The State presented no evidence during the hearing on the motion to suppress to suggest or establish that the police had probable cause to believe that contraband or illegal items were located in the semi-truck.

(4) While the State presented testimony that ECM data might be overwritten if the semi-truck was moved, the trial court did not find this evidence to be sufficient to constitute an exigent circumstance permitting a warrantless search. The trial court’s finding was supported by substantial evidence.

(State of Missouri v. Anthony West, WD80879)