There are some really good and reliable urine tests you can buy over the counter, if you check with your pharmacist, they will recommend the most accurate. I am the mom of an addict, and do test her, altho I buy the one that will detect four different drugs.
THC stays in the system longer than most. If this is something you will need to do a regular basis, you check on line, as the cost is much less. In the store the cost per test is 39.99 for the one I use.......I wish I didn't have a need to buy in"bulk", but I am fighting for her life, and that is not an option.
Good luck, and if you have questions, make sure you get the answers.....God knows I accepted a lot of lies, we want to believe our children, but a mother's "gut instinct" is rarely wrong.
thats because its always going to change depending on the person. i have never heard of blood for thc. i have only heard of urine and hair. hair is like 6 months but its really expensive so most jobs wont do that. theres so many factors that change the timeline. thc is stored in fatty cells..so his body fat, amount he exercises, water he drinks etc. will all affect the timeline. but a general rule of thumb is 2-4 weeks. why do you want to drug test him? maybe you should just talk to him. this may not matter to you at all, but id be pretty mad at my mom or dad if they did that out of the blue..if hes done a lot of things to warrant it thats a totally different story.
what about blood? Seems every site on Internet has different timeline.
if he smokes a lot its in his system for close to a month in urine..if he doesnt smoke a lot and he just smokes once it could be gone in a few days