While the Swiss study was technically doping (900μg in a 12h period, compared with the WADA limit of 800μg), it showed two things which are relevant, first a high of over 3000ng/ml in urine, and second the extreme sensitivity of urinary concentration to time. Taken together, they make determining the total dose taken from a single urine test look more like a coin toss than actual science.
It's not you he has to convince :)
While the Swiss study was technically doping (900μg in a 12h period, compared with the WADA limit of 800μg), it showed two things which are relevant, first a high of over 3000ng/ml in urine, and second the extreme sensitivity of urinary concentration to time. Taken together, they make determining the total dose taken from a single urine test look more like a coin toss than actual science.