Jenelle Evans’ own mother says she banned the reality star from seeing her oldest son Jace after she tested positive for marijuana while she was pregnant with her newborn daughter,  Breaking Celebrity News can exclusively report.

Barbara Evans opened up about the explosive court documents exclusively published by Breaking Celebrity News, in which baby daddy Nathan Griffith’s mother asked a judge for emergency custody of Jenelle's second son Kaiser after the reality star was investigated by the Department of Social Services for having drugs in her system when she gave birth and passing it along to newborn Ensley Eason.

“That’s a fact,” Barbara told Breaking Celebrity News about the bombshell investigation Doris Davidson revealed in her filing. “I have Jace, so when something like that happens, they contact me.”

She told Breaking Celebrity News that she used that investigation against Jenelle to keep Jace, 7, away from her.

“That’s the reason we were going to court. I can’t send him over there when that’s happened Ensley testing positive for drugs. I don’t want to put him in that atmosphere,” she said about her grandchild Jace, of whom she has full custody.

“I knew all along about Ensley and never exposed it until the day of court in May,” Barbara told Breaking Celebrity News. “And the baby was born in January. All that time I never opened my mouth.”

Barbara also told Breaking Celebrity News that the Teen Mom 2 cameras were rolling after court when she discussed the drug investigation.

“I’m very curious if MTV will air the footage of me from the day I went to court with Jenelle,” she said. “After court I was talking to one of her girlfriends, Jamie, asking her 'what do you think about this decision.' I told her, ‘You just don’t know all that’s going on.’ I said, ‘If you people only knew this true story. This is not about me or her, this is about Jace’s life.' They filmed that."

“I said it Ensley testing positive for drugs. Everybody thinks that I held Jace back, I told the girl. That’s the reason why. She said ‘I didn’t know that.’ Well, nobody knew it. I was contacted about the investigation and told about it in court."

Barbara told Breaking Celebrity News that she had been cut off from her two younger grandchildren by Jenelle.

“She won’t let me see Kaiser or Ensley. I can’t see either one of them. She did that a long time ago. Same situation. She won’t let me see them. Then she says to me ‘You don’t want to see your grandkids,’ but I told her ‘Last week you told me you would have me arrested if you came on your property.’”

Barbara also dropped another shocking allegation — that Jenelle smoked marijuana while