Many hundreds of students have been invited by Kings College London to participate in a study which will involve nasal administration of cocaine.
"After cocaine administration, repeated biological samples (blood, urine, hair, sweat, oral fluid) will be taken to compare and investigate how cocaine and its metabolites are spread through the human body," explains the email.
"This is an important scientific study to investigate how cocaine and its metabolites are spread through the human body. All the relevant ethical approvals were received for this study. The study will be conducted under the highest level of medical supervision in a dedicated clinical research suite."