If you had full custody of your child and there was no court ordered visitation for the other parent would you allow them to have unsupervised visitation knowing they were a former drug addict and still using marijuana regularly?

For a little bit of background: the other parent abandoned their child for many years and the child didn’t even know they existed until recently.

Bonus question for the comments: Would you allow unsupervised visitation if they were using marijuana and Xanax with no prescription?