How does an officer recognize a stoned driver?

After California's passage of the Proposition 64 recreational marijuana initiative, authorities are on guard for impaired drivers for alcohol, pot, prescription drugs or all of the above. A Highway Patrol training supervisor explains the challenge
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After California's passage of the Proposition 64 recreational marijuana initiative, authorities are on guard for impaired drivers for alcohol, pot, prescription drugs or all of the above. A Highway Patrol training supervisor explains the challenge