If you have no written agreement with your employer or a signed employee manual requiring that you take a "tb" test or any other test as a condition of continued employement, you do not have to take any such test.The only time where you would be required to take such a test would be the result of a court order resulting from a request from a public health employee due to concerns for public safety ordering you to take such a test. To have you voluntarily take a "tb" test is something that you can take or refuse. That is your choice. You cannot be required to take any such test by your employer based upon what you have written.As to having a background check upon you by your employer, whether the employer does so or not, that is his or her perogative as part of the custom and practice of the business.