I recently went for a drug screen at ECS Safety in Alberta, Canada and tried to use the Monkey Whizz kit. The kit contains 3oz of urine and when I went to the test center, I was shown a glass that had to contain at least 4-6oz of sample. When I returned, the nurse threw my sample down the drain as she said it was not enough and to go into the lobby and consume water for a second test. As this would have me failing the test, I declined and was told that it was going on my record as refusing to urinate. As well, be careful of the smell as they check that too these days. While I'm sure that the urine would have passed if allowed, this is a heads up to anyone contemplating going this route.