[MA] visitation question

Hi.

I’m the mom and I have full custody. We agreed upon visits, however lately my child’s father appears to be heavily under the influence of some kind of drug…I don’t know if it’s heroin or crack-cocaine, but it’s something heavy along those lines.

I saw what appears to be needle marks on his neck and arms, He’s constantly using my bathroom even with nothing to eat or drink. He’s lost a significant amount of weight, he looks unhealthy/dying. His face is sunken in, and sometimes he’ll just…fall asleep. At an inappropriate time. If you know what i mean.

He already has an anger & mood issue..I don’t know if there’s an official diagnosis it’s just what I’ve observed about him.

I know in the past when he’s been to prison and jail, he will take anger management classes, more than 4 times that I know about and I don’t believe that’s done much. He still has these…outbursts and issues.

Now I believe he’s on drugs, it’s very shocking and apparent that something is wrong.

Am I allowed to cancel a visit with him due to this reason?

He’s not involved consistently as it is and my child and her father are just now trying to build some kind of relationship (she’s currently 7) skipping out on visits as of recently in the past, after not being around for a few years.

He’s also facing 5 yrs in prison, trial starts in November. Around the corner.

I don’t believe it’s in my child’s best interest to see him like this.