Teyana Taylor says Iman Shumpert ignores the safety of their children when they're in his care ... accusing him of smoking weed and being under the influence when he's with them.
The singer takes some shots at the former NBA player's parenting skills in new legal docs from their nasty divorce ... and Teyana's not pulling any punches.
According to the docs, obtained by TMZ, Teyana claims Iman consistently fails to properly care for their two kiddos .