The law enforcement officers may use the following methods to establish a probable cause for your related DWI arrest:
Field sobriety tests: Ideally, most prescription drugs may not show up on breathalyzer tests, and police usually use field sobriety tests to prove prescription drug intoxication.
Blood test: Once you are arrested, you will be requested to submit to a blood test. This test provides critical information on your substance use that can be used to prove your charges.
Statements: the statements you make can and will be used against you in court. Admitting that you took pain medication, antidepressant, sedative, and all the other prescription medication can be all that a prosecutor needs to convict you of drug-related DWI