Is it illegal in the state of Texas that when an potential employer calls a previous employer...?

and the previous employer gives a very bad description of why the employee would not be hired again. I was under the impression that they were only aloud to say if they were eligible for rehire or not...
Update: Joe C... before you rant about Freedom of Speech it would might be wise to know the whole situation and to who/what it is regarding.
Update 2: Thanks for all of your help! Extra thanks to the ones that weren't accusational
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