Lamar Odom's Dad -- My Son DOESN'T Have a Drug Problem

Lamar Odom's father tells TMZ he believes his son is "clean" and does NOT have a drug problem.

Joe Odom just told us he simply doesn't buy the story TMZ broke ... that Lamar is deep in the world of drug abuse and specifically crack.

A regretful Joe says he's sorry he lashed out at the Kardashians, reportedly saying Lamar would be better off without them. Joe tells us he believes the Kardashians are a "wonderful family," even though he reportedly had said "They don't give a f**k about my son."

Joe says what set him off was a segment on "The Wendy Williams Show" in which someone trashed him as a heroin addict. He says he's been clean for 30 years and adds, "Nobody's perfect."