John, nurse and a human subject

John testifies during his fifth drug test.

As a nurse, John is contributing to research by being involved in clinical trials since he was a nursing student.Being a human subject suits him well because he feels accompanied and followed by the nursing stuff. He can also offers holidays to his family.

Extract : "At the moment I am completed a three-week study with three periods on two nights in-house stay. Besides the financial aspect that is quite motivating, it is also a time where you can meet and discuss with other volunteers."