do you ever worry about being robbed by the police in the USA?

in mexico we do, the police are as likely to rob you as any criminal. though it's not technically a robbery, it's actually extortion; they look to create a scenario in which they can extort a bribe out of you; i.e. they try to get you to bribe them (to the point that if you are willing to waste the rest of your day and go the the 'police station' they often just drop it and let you off with "a warning"). it's essentially same as a robbery but they're wearing uniforms.