The Fourth Amendment of the Constitution makes it illegal for police to make arrests without probable cause. In reality police make many unjustified stops based on a guess or on a particular time of day. This is highly illegal and if it proven that the stop was made without probable cause, the resulting evidence is normally suppressed. This is why it is very important to consult with a qualified DUI attorney to make sure your rights have not been violated.
Attorney McShane discusses random stops for DUI in his blog post: PA DUI Police Violate our Constitutional Rights.
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