If someone is not a regular marijuana user will it show up in there blood or urine test ?

The question is: How long after marijuana use is testing done & just how long, how often & how much marijuana was used by the person who is not a regular marijuana user.

Varies: Detection time depends strongly on the kind and sensitivity of the test employed; the frequency, dosage, and last time of use; the individual subject's genetic makeup, the state of one's metabolism, digestive and excretory systems. An occasional user can often clear marijuana from the urine in about a week and the blood in a few days. Heavier users can take a much longer time. Don't risk it.