What problems cause a DOT drug test to be cancelled unless it is corrected?

The following problems will cause a DOT drug test to become cancelled unless corrected. The DOT refers to these problems as correctable flaws.

The employee’s signature is omitted from the certification statement (Step 5), unless the employee’s failure or refusal to sign is noted on the “Remarks” line of the CCF.
The certifying scientist’s signature is omitted on the laboratory copy of the CCF for a positive, adulterated, substituted, or invalid test result.
The collector uses a non-Federal form or an expired Federal form for the test. This flaw may be corrected through the procedure set forth in §40.205(b)(2), provided that the collection testing process has been conducted in accordance with the procedures of this part in an HHS-certified laboratory. During the period August 1–October 31, 2001, you are not required to cancel a test because of the use of an expired Federal form. Beginning November 1, 2001, if the problem is not corrected, you must cancel the test.