DUBLIN — A Dublin woman returned to her home one July morning to find her 18-year-old son dead on the bathroom floor from a suspected fentanyl overdose.

When police searched the teen’s phone, they discovered his suspected drug dealer was a man well-known to East Bay police. He allegedly called himself “The Abominable Dro Man” — the term “dro” being a slang word for marijuana — but his real name is Mark Overton Allen and he has long been suspected of selling drugs to teens, according to authorities and court filings.

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Allen, 33, has now been charged in federal court with possession with intent to distribute cocaine, an offense that carries up to 20 years in prison. The criminal complaint alleges that he arranged to sell cocaine to an 18-year-old, but instead gave him drug

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