The first stage of the process at any lab is to sift out the definitely-innocent non-virus files from the potentially infected ones. Many labs use one or more processes to accomplish this, usually by identifying the known "normal" files by matching them against an ever-growing database of files which have been thoroughly analysed and verified as virus-free. Using checksums and other pattern matching technology, each new file is compared to the known clean files to determine if it should be subject to further investigation or simply culled from the analysis process. If a file matches a known-clean file, it is removed from the process and the customer informed that it is not a virus. On any given day, the ratio of safe to suspect files received in a lab can vary tremendously.
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