[sigstoat]

> His blood showed levels of cannabis. However, if you've ever had to pee in cup you also know that cannabis shows up in blood/urine far after you've smoked or consumed.

yes, metabolites show up for a long time in urine, making it useless for this sort of thing.

they don't stick around nearly as long in blood, and it is suitable (along with expert interpretation) for getting a sense of whether or not somebody recently high.

> However, if you've ever had to pee in cup you also know that cannabis shows up in blood

peeing in a cup does not give you insight into this.