Doping

If anyone hasn't read it already. Read this INRNG article:
http://inrng.com/2017/12/chris-froomes-salbutamol-case/#more-32655

Key points:

Another test took 32 athletes, administered permitted doses, made them exercise until dehydration and 20 exceeded the limit.

And this chart, the red line is the UCI limit:

Each arrow is "3 inhalations of Ventolin"

This research is from the Swiss anti-doping research laboratory and shows spikes in salbutamol levels following administration of a therapeutic dosage.

The main thing to remember is that this is a test of concentration in urine, if you're dehydrated that concentration is going to be much higher, and as the graph shows it isn't the case of inhaling X amount of X amount then showing up in your urine.