(Portland, OR)  --  A man is accused of driving drunk and causing a chain reaction by crashing into a police patrol car on Highway 26.  Sheriff's Deputies in Washington County say they were finishing a field sobriety test for Tash Desai of Portland around 2:45 Sunday morning when one of the patrol cars was rear-ended by another driver.  That driver was identified as Earl Smith of Portland and detained at the scene.  Tests showed both men had blood-alcohol content levels more than twice the legal limit, but nobody was injured in the crash.