title: Types and roles of a witness.
authors.affiliation: Forensic Epidemiologist, Point Park University, Pittsburgh, PA 15222, USA. sakoehler100@hotmail.com
authors.forename: Steven A
authors.initials: SA
authors.lastname: Koehler
mesh_terms: D005104:Expert Testimony / Q000331:legislation & jurisprudence / Q000379:methods / Q000592:standards; D035082:Federal Government; D053604:Forensic Nursing / Q000458:organization & administration*; D033161:Government Regulation; D017408:Guidelines as Topic; D006801:Humans; D024802:Nurse's Role; D014481:United States