Dr. Lynn Hillyer:

We take hair samples as well. The key is to take the right samples at the right times. Hair samples, blood samples and urine samples all have good qualities and show us different things. The key is to use them in a mixture. We do that every day. Every time we go racing, we look carefully at which sample we need to take from each horse. That is the same whether it is done on the track or off it. That is what gives us our strategy and is very important.