never been roofied but i have shrugged off some narcotics with alcohol..
ambien
oxy codiene(i can handle about 4 mix with alcohol
and others
like i said Dave would never get the chance i am really picky with who i drink and socialize with. my personality traits wouldn't allow me to take a drink from him or any stranger let alone my friends and i hold onto my drinks.. i doubt he try it or get past me or my friends