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A Novato man was arrested after crowing about his drug sales activity on Facebook, the county probation office said Monday.

Vinicio Rivera, 24, was booked into Marin County Jail on suspicion of drug trafficking and related counts. His bail is set at $100,000.

Rivera is also being held on suspicion of violating the term of his probation in a prior case, which also involved drug trafficking allegations.

Probation Officer Trevor Lilian noticed Rivera’s boasts on social media, the probation department said. When Rivera arrived for his regular probation check at the Civic Center two days later, investigators searched his car.

The investigators found 5 pounds of marijuana, about half an ounce of suspected Ecstasy and a pound of hallucinogenic mushrooms. The drugs had an estimated street value of $15,000.

Detectives also found a digital scale, plastic baggies, three cellphones and nearly $2,000 in cash.

The probation department said the case was its largest seizure of drugs through monitoring social media.