The police chemist assists the Columbia Police Department in criminal investigations by providing scientific analytical services in a timely manner and expert assistance. The chemist performs scientific examinations of evidence and can provide assistance in the collection of evidence at crime scenes when requested. The chemist may be asked by the Solicitor and city prosecutors to provide expert testimony in criminal court on the findings. Analyses performed in the laboratory are often the definitive factor in proving the guilt or innocence of persons charged with criminal acts.