By means of a simple technique, doctors can say if someone is under the influence of a drug (through blood), if they have taken it within the last week (through urine) or if they usually take it (through the bile test). However, a research group of the department of Legal Medicine and Psychiatry of the University of Granada (Universidad de Granada), coordinated by professor Antonio Hernández Jerez, has developed a new technique to obtain this information by testing the pericardial fluid.
