My research shows the level of THC in his blood indicates marijuana use within 4 hours more or less or a regular user.
He should not have been impaired.
>> “My research shows...” <<
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LOL!
My ‘research’ (done long ago) shows that marijuana use doesn’t necessarily ‘impair,’ it can ‘enhance,’ such as rolling two 300 games in succession at the old Santa Maria bowling alley. :o)