Maintenance personnel in a food service establishment . should not be allowed in the food preparation area at any time
should be trained in food safety procedures
should undergo a background check for a history of product-tampering
should be trained in food preparation as a backup

That's  a project for you to do. btw your teacher probably uses a plagiarism detector and if you do copy anything on this site she/ he will find out and instead of getting a good  or bad grade you'll  get a 0 no exceptions, and they'll  probably call ur parents. so do some research ask friends and fam to you.