Fingerprints to reveal drug use.(Forensics)

In order to arrest a culprit, police look for fingerprints at the scene of a crime. Magnetic powder is applied to the surfaces of objects with a brush to make these prints visible. It now may be possible to use fingerprints to detect the use of drugs as well. In fact, forensic scientists would not even have to change the magnetic brush technique they have used since the 1960s: British scientists at the University of East Anglia, Norwich, and King's College, London, have developed a process based on magnetic particles and antibodies that causes fingerprints to fluoresce if they were made by a drug user.

Components of drug metabolites can be detected in sweat. "This also works …