Criticism by privacy advocates has caused the U.S. Homeland Security Department (DHS) to review its proposal for private companies to provide the government with a U.S.-wide database of licence plate tracking information.  The concerns raised by privacy advocates include the gratuitous nature of the privacy intrusion, the lack of regulations and safeguards regarding the data collection, and the lack of measures that would provide for audits of the system. The data collection proposal by the DHS was made public Feb. 12 on the government website, Federal Business Opportunities.  The website, also known as Fed Biz Ops, is a public