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If you testify to the truth under oath and then suffer retaliation from the employer for doing so, then this could be grounds to sue the employer for retaliation and seek damages from them for them taking action against you for telling the truth in your deposition under oath.
Unfortunately, you have to give your deposition in front of both parties to the suit because every party has a right to question someone in a deposition.
If your employer subsequent to the deposition begins retaliating, such as writing you up for things you were never written up for or terminates you, then you could have grounds to sue the employer for damages.
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