Hello @CAhomeowner and a warm welcome to the Community Forum 
This link attached is for your reference, but just to confirm all sitters are verified. However you can also complete your own checks. We were asked by the owners of a 40 room English Country Stately House, where we looked after 12 horses, to provide copies of our criminal records check, in England known as DBS checks, which we were more than happy to supply.
Another good way of finding out about potential sitters is to read their reviews from their completed sits and of course to have a video call before agreeing to any sit. This way you can get a good feeling about them and who they are. Of course this also gives both sides the opportunity to ask any questions.
Also for reference once you are a member, and your listing is completed you can also add your TrustedHousesitters profile on to your Forum profile by following the attached link, should you wish. This will then enable others to offer you helpful advice and feedback and will also give your listing extra exposure!
I have also attached a video for you to have a look at to show you how it all works.
Also, remember you can use the spyglass symbol at the top of the page next to the TrustedHousesitters logo and search for any questions that you may have as they have most likely already been answered on here and of course if not then please just ask!
I hope this helps. 