It's only in place indirectly - if someone calls you regarding a hire and you trash talk the individual being asked about, you'd better have documented proof of those claims. Otherwise, it's slander, and if the person applying at the new place finds out, they can come after you.
Common practice is as above, confirm dates of employment and job title. If the other person offers more, that's fine, but that comes with the inherent risk that they will something untrue or otherwise slanderous.
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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