There are many ways a police officer will LIE and trick you into talking. It's always safe to say the Magic Words: "Am I free to leave? I'm going to remain silent and I want a lawyer."
The following are common lies the police use when they're trying to get you to talk:
* "You will have to stay here and answer my questions" or "You're not leaving until I find out what I want to know."
* "I have evidence on you, so tell me what I want to know or else." (Police can fabricate fake evidence to convince you to tell them what they want to know.)
* "You're not a suspect, were simply investigating here. Help us understand what happened and then you may leave."
* "If you don't answer my questions, I won't have any choice but to take you to jail."
* "If you don't answer these questions, you'll be charged with resisting arrest."
Unfortunately, you, Johnny Q. Citizen, are not allowed to lie to the police in return. As always, the best weapons in the citizen's arsenal for protecting his Constitutional rights is to repeatedly ask "am I free to go?" and state plainly and clearly, "I do not consent to a search".* "Your friend has told his side of the story and it's not looking good for you, anything you want to tell me?