Yes, marijuana in illegal.
No, the marijuana is the fruit of the poison tree and the police have no right to arrest him because of Bob's assumed right to privacy.
The police had no right to enter Bob's apartment without a properly executed search warrant.
It was a special situation, but I really don't think Bob should be arrested.
Pete should be prosecuted to the full extent of the law as a tax evader.
Pete probably shouldn't have the cigarettes but the police should leave him alone.
The cigarettes are Pete's private property and he is protected by the Constitution from unnecessary searches. However, there is no excuse for breaking the law.
The police have no right, even under the circumstances to enter Pete's apartment without a search warrant.
For his own good, Harry should be immediately transported to the hospital.
Without probable cause, such as the sounds of a struggle or firm knowledge that the terror suspect had indeed been in Harry's apartment building, the police had no right to enter Harry's apartment without a search warrant and any illegal items found in the apartment are not admissable evidence in a court of law.
Even though the search is illegal on Constituional grounds, Harry should be immediately transported to the hospital and arrested after he is checked out.
Sensing that the occupants of the apartment might be in danger, the police had a right to enter Harry's apartment. Finding the heroin in plain sight, they are right to arrest him.