Chief,
Just because they draw your blood doesn't mean they will screen it for drugs. If they are going to test your blood for drugs, they have to have consent, FYI. Same goes with the urine. So if this is just routine work up for a physical there is a chance neither may be tested but it still seems redundent to test both as well as a waste of money.

I wasn't trying to be offensive with the info on weight. It is just that since THC is fat soluble, being overweight tends to increase the time to get clean.