It is very easy for a visitor to not follow the GMPs that are designated for them to follow.
Especially, since most facilities I've been to simply post a list of them and expect each visitor to read and understand them in a couple of seconds.
Our clients train their employees on the GMPs and explain why each one is important, not just tell them they are important but explain the why and how it can impact fellow employees, the facility and customers.
In addition they train their contractors on a completely separate GMP statement by not just sending them a GMP for contractor list but having each one and in turn their workers come in for a training session explaining the impacts of their actions on the employees, fellow contractors, the company and customers.
With visitors it is most times the Operations personnel or Quality Assurance Manager that will review the Visitor GMPs and then reinforce the requirements (such as if they are going into the facility and not just the office area) by guiding them in the GMPs from the office area for instance for removal of watches, rings, earrings, etc to stopping them to wash their hands, sanitize, don a coat, booties, etc.
When I was a Coca Cola facility once they had a mandatory visitor video program that a visitor had to watch prior to entry - it was very well done.
All the Best,
All Rights Reserved,
Without Prejudice,
Glenn Oster.
Glenn Oster Consulting, LLC
Consultants for SQF, ISO-certified payment systems, Non-GMO, BRC, IFS, Lodging, F&B
http://www.GlennOster.com -- 774.563.6161