There are two ways for law enforcement officials to make a DUI arrest: evidence that the driver is impaired by weaving or driving erratically, or evidence of DUI per se intoxication through a breathalyzer test showing a blood alcohol level of .08% or more. All states accept the "per se" evidence from a breathalyzer test as proof of intoxication. There is no other evidence required to arrest a DUI suspect. Both the evidence of impairment and the "per se" evidence of intoxication can stand alone as grounds for a DUI arrest. In order for the breathalyzer test results to be accepted in court, the equipment has to be calibrated and maintained by a licensed operator on a regular basis. A law enforcement official cannot administer the test until 15 minutes after the suspect has eaten, vomited, or put anything in their mouth. Not observing those specifications can result in a false reading.