Does this sound like what you're dealing with?

To (Enter manager name)

I regret to inform you that I will be unable to continue working at CVS. I am willing to continue to work till (enter date) so as not to cause schedule difficulties.

 I find it too stressful to work in a store that encourages shoplifting through a lack of consequence to the shoplifter. It would be easier to hire someone to stay by the entrance to check receipts and turn away individuals who have been trespassed. I also find it insulting and discriminatory that employees are the only people checked when they leave. Lastly it is quite stressful and embarrassing to work with such antiquated registers that should have been replaced over a decade ago. I wouldn't mind working at CVS again if these problems were properly addressed.

Sincerely 

(Employee name)