Abby Clarke is a woman who was raped on a spiritual retreat by Declan Trask. A tape allegedly appears to imply Abby "consented to" the rape, which made it difficult to prosecute Trask. It's revealed she was hypnotized to succumb to the rape and have little to no recollection. Trask learned the technique after recovering from drug addiction, followed by numerous women accusing Trask of rape while they were hypnotized.
The team were still ready to take the gamble of calling out his neurolinguistic manipulation used in the crimes, needing evidence to prove it in court. What got to the jury wasn't just evidence of learning the hypnotic technique, but he was also revealed to have killed another addict he knew. As a result, with the evidence brought into court, Trask was successfully convicted of raping Abby. (SVU: "Spellbound")