I was going to do drug tests but then I decided not to because it became about me and the behavior I was going to allow in my home. I wasn't going to allow myself, my child or my home to be treated with disrespect whether he was high or not. I wasn't going to allow someone who acted like he was on drugs in my house, even if he wasn't. I wasn't going to allow someone to use my house as a place to sleep all day and watch MTV all night, whether they were clean and sober or not. I wasn't going to allow old "buddies" who I knew he used to use with in my house.
It stopped being about the drugs. It started being about me.
Of course, I kept random drug testing as an option. But I decided NOT to waste the money on the test when it came down to it.
If you do drug test, I suggest keeping one under the sink so you have it available when you need it.