Bam Margera is a danger to himself and others, according to the police officers who located him in L.A., and promptly put him on a 5150 psychiatric hold ... TMZ has learned.
Law enforcement sources tell us ... LAPD officers tracked down Bam Sunday afternoon by tracking his phone, and they eventually found him at Trejo's Tacos -- the L.A. hot spot owned by Danny Trejo.
We're told they made contact with Bam and found his erratic speech and behavior -- combined with recent suicidal threats he's made -- enough reason to call in a psychiatric evaluation team.