Officer Johnson has been conducting an investigation of Bob based on evidence that he is running a drug trafficking organization. Officer Johnson follows Bob to a condominium complex and observes him enter a residence. He then observes a plumbing company truck arrive and Paul the Plummer knocks on the front door and Bob lets him into the condominium. Shortly thereafter, Bob pulls out of the driveway and leaves the premises. Officer Johnson then knocks on the front door of the residence and Paul opens the door. Officer Johnson informs Paul that there is an escaped convict in the neighborhood and would like to enter the residence to look around. Paul immediately complies and Officer Johnson looks around the condo and enters the kitchen where he finds 5 kilos of cocaine in a cabinet under the sink. At that very moment, Bob walks into the kitchen and objects to Officer Johnson's presence. Bob is immediately arrested and Officer Johnson conducts a full body search of Bob. He finds a handgun tucked in the back of Bob's pants. Bob is a convicted felon and is not permitted to possess firearms. Please discuss the legal issues relating to:

(a) Officer Johnson's entry into the condominium;

(b) the admissibility of the cocaine; and,

(c) the admissibility of the handgun.