1. The police were summoned by UPS employees who had a package that had been returned by the driver as addressee unknown. When opened, it was found to contain a large brick of a substance that the UPS testers determined was C4 explosive. After conducting a field test that confirmed that the substance was C4, the police resealed the package and placed it in the undelivered section at UPS. They then waited for someone to pick it up. A woman appeared later in the day, claimed the package, and departed. The police followed her to a home known to them to be that of a suspected terrorist. Within minutes after the woman entered the home with the package, the police entered, arrested both the woman and suspected terrorist, and seized the C4. Was this warrantless action lawful?

2. Informant Z told drug investigators that Maxy Mum had sold her cocaine on numerous occasions. The agents asked Informant to arrange another sale with Maxy, and it took place on Monday on the sidewalk outside Maxys apartment. The agents witnessed the transaction from a remotelocation. After later confirming that the substance sold by Maxy was cocaine, the agents asked Informant to arrange another sale for the next day to occur inside Maxys apartment. At the appointed time on Tuesday, Informant went into the apartment. She came out 15 minutes later and informed the agents that the sale had occurred and that a large quantity of cocaine remained on the premises. Fearing that the contraband might be sold off to others, the agents moved in immediately, arresting Maxy and seizing the cocaine. Was this warrantless action lawful?

3. Ned Numbers, an accountant, is suspected of masterminding a major tax fraud scheme. Armed with a warrant for his arrest, IRS agents entered his 15-room home in Boca Raton, found Ned sitting at his desk in the study, and placed him under arrest. While one agent removed Ned from the chair, frisked him, and cuffed him, a second opened the drawers of his desk. A list of clients (many of whom were suspected of participation in the fraud scheme) was found in Neds coat pocket, and an illegally imported pistol was discovered in his desk drawer. Could the agents lawfully seize these items?