PHOENIX — The Arizona Supreme Court said police officers stopping vehicles based on suspicious behavior don't have to rule out the possibility that there could be an innocent explanation.

The justices on Thursday unanimously upheld a Cochise County judge's refusal to bar evidence from the stop of a vehicle whose driver was later convicted of drug and aggravated DUI charges.

The motorist contended that a sheriff's deputy needed to rule out the possibility that innocent behavior explained the driver's brief flurry of arm movements toward a passenger.

The Supreme Court said it's enough that the deputy made a common-sense assessment of circumstances that suggested possible criminal conduct.

The justices also said reasonable suspicions based on particular circumstances should be enough to reduce the risk of stopping many innocent travelers.