Rodney King  was an expert pot smoker ... and there's no way marijuana could have caused him to go off the hinges and act like a mania...

Rodney King 's closest friend tells TMZ ... he's asked cops to take a closer look at King's fiancée -- because their relations...

Rodney King 's fiancée is telling friends Rodney had been drinking all day Saturday ... and had smoked weed in the hours leading up to...