Am I required to take a field sobriety test if I am pulled over and suspected of a DUI?

There is a difference between a field test and an actual BAC or breathalyzer test. Because field tests are extremely inaccurate at determining whether or not a person is legally drunk, you could request a BAC instead. If you fail a field test, but do not fail the BAC, then they may not have probable cause to arrest you for a DUI.