L.A. Pot Shops RAIDED on 4/20

4/20/2011 5:55 PM PDT
It's high time for weeding out possibly illegal activity -- because law enforcement sources tell TMZ, the California Medical Board just raided two L.A. marijuana dispensaries ... on NATIONAL POT DAY.

We're told the government agency was executing some kind of search warrant at Medical Kush Doctor and Medical Kush Beach Club in Venice -- but it's unclear what they're looking for exactly.

UPDATE: Law enforcement sources tell us ... the search warrants were issued in connection with a criminal narcotics investigation.