CHICAGO (CBS)– CVS is expanding its COVID-19 testing program.

An additional 17 test sites will be added at select drive-thru locations across the state. The sites open Friday and will use self-swab testing.

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The sites will help the company’s goal of processing up to 1.5 million tests per month.

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Patients must register in advance and will be required to stay in their cars. Results should be available within three days.

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CVS already has 40 test sites open across the state.