Hair follicle drug test

My ex and I split while I was pregnant. He has a 5 year old that he has full custody of because the mother killed herself and we have a 10 month old together and I've been letting him visit whenever because I want my son to have a relationship with his father. Anyways someone called children's services on him and said he was doing meth and feeding it to his 5 year old. So he just had a hair follicle test and it could 4 or 5 days to get the results. He told me he did a little one time a month ago (which I'm extremely pissed about). My question is, is his kid going to get taken away or can he just take drug and parenting classes? Will he go to jail? Will the 5 year old be taken to foster care? Should I let him keep visiting my son?I'm really torn about it. Really appreciate any feed back