Chemical Tests: In Colorado, once the officer has placed the DUI suspect under arrest, the officer should give the DUI suspect a choice to take either a blood or breath test (if the officer believes the person is on drugs, the officer can make the choice between blood or urine).  These are the tests used to determine a person’s BAC (BrAC for breath test).  The BAC is basically the measurement of the amount of alcohol in a person’s blood stream.  A person driving in the state of Colorado has automatically “expressed consent” to take a blood, breath, or urine test once the officer has reasonable suspicion that the driver has been drinking (or taking drugs).  If the DUI suspect refuses to take the test that person will have his / her Colorado driving privileges revoked for 1 year for a first time refusal.