Fatal overdoses have quadrupled in Marin in the past few weeks. From Feb. 14 through March 1, there were five suspected fentanyl-related overdose deaths—a rate four times higher than normal. The overdoses, which are occurring across Marin’s towns and cities, are linked to methamphetamine use and are affecting those with known risks. The spike has come with corresponding surges of those substances in wastewater and the number of 911 calls for non-fatal overdoses. “We’re experiencing…