They want a urine sample because cannabis use is best detected that way.
It can show cannabis use during the past 28-35 days so they are checking to see if you were honest about when you last used it.
I understand that they wish to detect cannabis but why not use my blood test? When you say best detected that way it sounds like they are trying to catch me out!
This is my issue as I have used cannabis after my original medical but I was honest in my first medical about when I last used it.
Any idea how they would determine if I passed a Urine drug screening if they have not legal limits?