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It is well established that the main psychoactive constituent of cannabis, Δ Using a double-blind, placebo-controlled, within-subjects design, healthy volunteers (N 23) viewed negative, neutral, and positive pictures (emotional memory task) and lists of semantically related words (false memory task). Forty-eight hours later, participants ingested a capsule containing either THC (15 mg) or placebo and completed tasks to test their memories for the previously studied pictures and words. THC during retrieval did not reduce the number of correct responses to studied items. Instead, it robustly increased false recollection on both the emotional memory and false memory tasks. This effect was found for both neutral and emotional items. These findings show that THC has adverse effects during memory retrieval, distorting both neutral and emotional memories. Coupled with THCs known effects during encoding, these new retrieval findings are important in light of the spreading acceptance of cannabis.