If you are writing a modern police proccedural based in the USA, you need to know about the first fully accredited independent forensic laboratory.
Integrated Forensics Laboratory
They offer services to Law Enforcement Agencies, Attourneys and corporate clients accross the US. There are also some downloads on the site, especially useful is the chain of custody form which could be used in an evidence tampering case or as part of your denoument.
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