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CHARLOTTE -- The Charlotte-Mecklenburg Police Department purchased $9 million worth of high-tech security for the Democratic National Convention, and now Chief Rodney Monroe wants to expand the system for day-to-day operations.

The ACLU of North Carolina is concerned about the continued and expanded use of the cameras.

"It can, under some circumstances, keep tabs on where you're going," said legal director Chris Brooks, referring to the license plate technology associated with the cameras.

Brooks added the fact the public isn't being allowed to comment on the use of the technology is a red flag. Another issue is the long term storage of the data, which can range up to several months.

Brooks also points out the surveillance can quickly become a problem.

"Whether you're low- or high-income, there's a certain expectation of privacy. This sort of surveillance can very quickly lead into profiling," said Brooks.