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Dr. Drew says Rob Reiner's son was likely using 'methamphetamine'

While on "The Will Cain Show," Dr. Drew addressed how Nick Reiner allegedly used a knife in his parents' murders, saying "the instinct" he has is that Nick was "also on stimulants such as methamphetamine," explaining "the wildness of this behavior."

The addiction specialist highlights how meth can drive users into dangerous, psychotic states, leading to armed confrontations and says similar dynamics may have factored into the Reiner incident.