Some retailers, like Walgreens, report that locking items behind displays to deter shoplifting may not be effective. Walgreens CEO Tim Wentworth recently described theft prevention in stores as an ongoing and challenging struggle.

Retailers have been faced with increases in shoplifting and retail theft. But anti-theft prevention can hurt retail sales, says the CEO of Walgreens.

Over the years the pharmacy chain used strategy to combat shoplifting. Walgreens CEO Tim Wentworth said the company’s decision to lock up products after reporting a 52% increase in stolen inventory has backfired, according to multiple reports.