This lesson provides guidance for law enforcement officers on the following topics:

• Do police need a warrant to collect DNA from a suspect’s discarded drinking straw?

• When do exigent circumstances permit a warrantless entry into a home?

• When can an officer be liable for malicious prosecution?

• If an officer arrests a suspect on a warrant that had been recalled but which, due to a clerical error, had remained active in the computer system, will evidence discovered during that arrest be suppressed?

• When does an officer use excessive force while detaining a suspect?