Abstract: A method of tagging and detecting illicit drugs or paper currency is disclosed which comprises the steps of:(a) applying a Perfluorocarbon Tracer (PFT) to the drugs or currency such that said PFT is released over a period of time as a vapor taggant; and(b) subsequently detecting the presence of said vapor taggant, and therefore the drugs or currency.

Abstract: A biopsy needle for removal of tissue from human or animal bodies incorporates a tubular elongated body (1) and a plunger (7) arranged both slidably and rotatably within the body. The plunger is pointed at one end and has a tissue-removing edge directed backwardly from the pointed end and formed on a flap (9) supported by the body (1) and movable between a retracted position in which the tissue-removing edge lies within the lateral confines of the body (1) and an extended position in which the tissue-removing edge lies beyond the lateral confines of the body (1). The wall of the body (1) is formed with an aperture (2) with which the flap may be brought into register by movement of the plunger (7).

Abstract: A lock-out security arrangement for and method of maintaining microprocessor-controlled electronic equipment normally operational until the occurrence of a disabling event, such as physical removal of the equipment from its normal installation, and/or electrical removal of the equipment from a source of electrical power, and thereupon for disabling the equipment after detecting the disabling event and for maintaining the equipment disabled, even after the disabling event has been discontinued, until a code manually entered via a keyboard associated with a microprocessor for controlling the normal operation of the equipment matches a private access code whose identity is protected from external interrogation by reason of being stored in an internal non-volatile memory of the microprocessor. The private access code is preferably selected by and known only to the user, and may be changed to a different private access code at the user's option.