Blacklists are legal when used internally. What constitutes an internal use of privileged employment information? The simplest example is when you are terminated from a hospital and attempt to be rehired in a different department. Your employment details are available via Human Resources to all managers and is likely that you will not be hired. Too obvious, right? Well, let's expand this simple example.

Now imagine that this hospital is part of a group or chain of hospitals such as HCA or Tenet. Sharing your personnel file with all of the hospitals is still internal to one employer and thus legal. If you try to get another position with an HCA hospital, even one in another state, you may out of luck.

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