Oakland man allegedly made $20 fentanyl deal in San Francisco. The next day he had a tracking device on his car

OAKLAND — On Aug. 1, an undercover cop allegedly purchased 1.8 grams of fentanyl from 25-year-old Marcos Carcamo in San Francisco’s Tenderloin neighborhood.

The very next day, police obtained a search warrant and stuck it to Carcamo’s Chevrolet Cruze. What the data showed, according to prosecutors, were the movements of a fentanyl dealer who was later busted with six pound of various drugs and more than $58,000 in cash.

Carcamo, an Oakland resident, is now in Santa Rita Jail facing federal drug distribution charges. He was arrested Oct. 10 and remains in custody while the charges are pending.

The case against him might have started with a small-scale drug deal, but the GPS data showed Carcamo was making trips to the Tenderloin from Oakland “almost every evening,” a federal investigator said in court papers. He later reportedly told authorities he had been selling drugs there for eight months and made $1,000 per week, according to the criminal complaint.

Carcamo’s home — where he stayed with a family member and another man — was searched in August. Authorities allegedly found varying amounts of methamphetamine and fentanyl hidden all over the house. There were drugs in the toilet, the dishwasher, bedrooms and in the Chevrolet, as well as a money counting machine, a safe full of cash, a pistol and ammunition, according to court records.

The case is one of dozens of Tenderloin-based drug cases that have recently been filed by federal prosecutors in past weeks. Several of the other defendants have already entered guilty pleas and been sentenced to time served, according to court records.

Carcamo has pleaded not guilty.