Scientists pick sex and eating habits from a drop of sweat and fingerprint

is the stuff crime novels are made of - the ability to tell a suspect's sex, diet and smoking habits, all from a single drop of sweat
Soon, police could have such technology at their fingertips, with the development of a technique that allows them to build up a profile of a suspect from nothing more than a fingerprint.
Scientists at Imperial College London have shown that fingerprints contain vital information about a person's habits.

Offender profiling, or more scientifically, psychological profiling, is a behavioral and investigative tool that helps investigators to profile an unknown subject ("unsub") or offender(s). Offender profiling is also known as criminal profiling, criminal personality profiling, criminological profiling, behavioral profiling or criminal investigative analysis. There are so many different names because of the multiple television shows such as Profiler in the 1990s and The Silence of the Lambs that have changed what the FBI refers to as "criminal investigative analysis." In modern criminology, it is generally considered the "third wave" of investigative science: the first wave was the study of clues, pioneered by Scotland Yard in the 19th century; the second wave the study of crime itself (frequency studies and the like); this third and final wave is the study of the abnormal psyche of the criminal.

Racial profiling, also known as ethnic profiling, is the inclusion of racial or ethnic characteristics in determining whether a person is considered likely to commit a particular type of crime (see Offender Profiling). Towards the end of the 20th century in the United States, the practice became controversial among the general public as the potential for abuse by law enforcement came to light.