When you come into contact with law enforcement officials here in Utah or anywhere else in the country, you have certain constitutional rights that govern their contact with you. If those rights are violated, any evidence gathered from that point forward might not be admissible in court. This is why reviewing the circumstances surrounding the initial traffic stop when you are facing charges for DUI is so important.
A police officer's opinion that you are acting suspicious is not enough to initiate a traffic stop. Traffic stops must be predicated on some reasonable suspicion. Some actions that can provide an officer with reasonable suspicion are speeding, reckless driving or weaving. Even driving too slowly or not using your turn signal can give an officer a reason to stop you.