Think he's on drugs?

My boyfriend is an ex drug addict. He's been clean for about 3 years now. Since we had our daughter. He missed the birth and everything because he ended up in jail. Anyway, he just lost his job a few weeks ago, so he's stressed. Same day he lost his job we found out we were having another baby. More stress. He started working with my uncle, who is a real druggie into cocaine. His brother came up to visit for the weekend, who is another big druggie always trying to bring my boyfriend down. Apparently his brother went running his mouth drunk to MY PARENTS about my boyfriend and him having cocaine. Also, my uncle docked my boyfriend half a day of work supposedly cause they only worked 1/2 day. They left at 7 and didn't come home until 4 that day. But he says they didn't work, they were waiting for a part. He's never done this. Which tells me he may of gotten fronted the drugs. He's also been acting very strange. But denies EVERYTHING & swears on our daughter he isn't!