Reusable bags are completely safe to use and not a health concern at all - they just need to be washed.
Plastics Industry spokespeople claim that reusable bags are dirty and unsanitary. But, Health Canada, Toronto Public Health and others have confirmed that reusable bags pose no significant health threat, and simply need to be laundered on a regular basis! In fact, the shopping cart in the grocery store, and any coins or money in your pocket likely has more bacteria than a reusable bag (and they can’t be thrown in the laundry!).