Laboratory Request Guidelines (LE ONLY)
Forensic Laboratory Request
Requests for analysis on criminal investigations may be submitted by a LE agency to the Laboratory to initiate a specific test(s). Please see below for more information regarding requests and the testing process.
Please ensure that one request is submitted per case which contains all of your needs so that the laboratory can accurately evaluate the proper handling of the evidence item(s). Sequence of analysis is important to maintaining the value of the tests completed. In most cases, DNA analysis must be completed first to avoid inadvertent contamination, followed by latent print processing and then examination by other disciplines, such as Firearms.
For NIBIN, (National Integrated Ballistic Information Network) requests, Outside Jurisdictions have been authorized to submit “NIBIN lists” to request a group of firearms for NIBIN entry.
Selection of Test Method
Based on the type of evidence, information provided and the request received, the LVMPD Forensic Laboratory will select the appropriate method(s) of analysis. A summary of methods used is detailed in each Detail/Unit specific webpage located under the Forensic Laboratory heading.
Deviation from Request
When necessary, Forensic Laboratory personnel may add or cancel analyses to a particular case. However, this will be discussed with the requestor prior to conducting the analysis. Likewise, changes by the requestor (Detective, District Attorney, etc.) to a previously submitted request will be discussed with Forensic Laboratory personnel.
Deviation from Standard Operating Procedures
Laboratory requests for evidence analysis will be worked according to analytical procedures specified in Detail/Unit specific technical manuals. Deviations from these procedures will be approved by a Forensic Laboratory Manager and documented in the case file. Deviations from DNA procedures will be approved by the DNA Technical Leader in the Biology/DNA Detail.
Many items of evidence may require techniques which are not amenable to fixed or established procedures, but which require judgments, comparisons, and varied approaches. Based on the nature of the evidence and the experience of the examiner, varied procedures may be used with appropriate scientific safeguards. If a varied procedure is utilized, careful and adequate documentation shall be made to support conclusions and results along with the use of sufficient controls and/or standards to assure the reliability of the test results.