However, police were unaware that were two different apartments on the third floor. Instead of searching for drugs in the McWebbs residence, they were actually searching in the Garrison apartment. The police found drugs and tons of cash - which were what they were looking for.
Garrison brought up a 4th Amendment claim and said that police can't use the evidence found in the apartment against him in court, as the evidence was found by using a warrant for his apartment, but the police officers thought his apartment was someone else's!
The Supreme Court ruled that although police thought they were entering someone else's house, the warrant was still valid, and the drugs and cash found in the apartment can be used against Garrison in this particular legal case.
