This unique collection contains data obtained from clinical samples over the course of more than 20 years. It encompasses 7500 potentially harmful substances, from simple analgesics to designer drugs, and from pesticides to chemical warfare agents. Since these substances are often broken down in the human body, metabolites are also included, so as to allow quick and unambiguous identification of the mother substance.

The 3rd edition gives all spectra in order of their molecular mass, since this has become the prime benchmark criterion for the identification of unknown substances.