First, check the qualifications: the third-party can issue the report only when they are qualified. Special industry or foreign laboratories, must also have the appropriate qualifications.
Second, look at the details of the process: the laboratory has the internal process to issue the report. Received sample-take photo-test-recheck-date-sign-stamp, this process will be reflected in the report, by checking the date of the report, date of receipt and report, has a seal or not, manager sign or not etc.
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