Stolen Police Uniform

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Getting a police uniform is a 2.5% chance,like others have said right click to steal from a cop car. You can also do this with a ambulance and a fire truck I believe. You can get a paramedics uniform as well as a fireman's uniform.
Be sure that you have a custom job title, a citizen would not steal from government vehicles since they follow the laws, make sure no one can see you too. It can come under fail RP then.