; and (2) update the database annually. (b) Contents The database under subsection (a) shall include, for each mode of transportation— (1) the total number of drug and alcohol tests by type of substance tested; (2) the drug and alcohol test results by type of substance tested; (3) the reason for the drug or alcohol test, such as pre-employment, random, post-accident, reasonable suspicion or cause, return-to-duty, or follow-up, by type of substance tested; and (4) the number of individuals who refused testing. (c) Commercially sensitive data The Department of Transportation shall not release any commercially sensitive data or personally identifiable data furnished by an employer under this section unless the data is aggregated or otherwise in a form that does not identify the employer providing the data. (d) Savings clause Nothing in this section may be construed as limiting or otherwise affecting the requirements of the Secretary of Transportation to adhere to requirements applicable to confidential business information and sensitive security information, consistent with applicable law. 8104. GAO report on Department of Transportation’s collection and use of drug and alcohol testing data (a) In general Not later than 2 years after the date the Department of Transportation public drug and alcohol testing database is established under section 8103, the Comptroller General of the United States shall— (1) review the Department of Transportation Drug and Alcohol Testing Management Information System; and (2) submit to the Committee on Commerce, Science, and Transportation of the Senate and the Committee on Transportation and Infrastructure of the House of Representatives a report on the review, including recommendations under subsection (c). (b) Contents The report under subsection (a) shall include— (1) a description of the process the Department of Transportation uses to collect and record drug and alcohol testing data submitted by employers for each mode of transportation