Law enforcement officers and crime scene technicians must use caution and protect themselves at all times from contracting AIDS or hepatitis. Bodily fluids must always be treated as though they were infectious. Crime scene technicians most often use dust particle masks or N-95 masks at routine crime scenes. They are considered the most common type of respiratory protection. These masks are considered to be disposable and should be discarded after one use.

It is imperative that all personnel involved in entering and processing the crime scene wear personal protective equipment (PPE). This consists of items of clothing that are non-porous, such as crime scene suits, nitrile gloves (double gloving recommended), face masks, and eye protection. These items will protect the CSI from exposure to blood-borne pathogens, most chemical and drug residues, and other contaminants that are health hazards. In addition, hair nets and booties over the shoes will help avoid contamination of the cr