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The day before, the sources familiar with the investigation said, probation officers found a large quantity of Xanax inside the Downey facility, where most of the approximately 270 detainees are 18 or younger.

A large quantity of Xanax was found inside the hall sometime before the overdoses, according to three sources with knowledge of conditions at Los Padrinos.

The gang had initially come to light after an investigation was launched by Pfizer, the manufacturer of the genuine Xanax tablets, which are used to treat anxiety.

The substances alleged to be involved in the offences are MDMA, butanediol, ketamine and alprazolam, which is also known under the brand name Xanax.

She had also ingested “half of a Xanax bar” to help with her anxiety over her son’s death.