In SanJuan v. IBP, Inc., 160 F.3d 1291, 1298 (10th Cir. 1998), the United States Court of Appeals for the Tenth Circuit laid out the elements of a prima facie claim for retaliatory discharge for filing a workers compensation claim: (1) The plaintiff filed a claim for workers compensation benefits or sustained an injury for which he or she might assert a future claim for such benefits; (2) the employer had knowledge of the plaintiff's workers compensation claim injury; (3) the employer terminated the plaintiff's employment; (4) a causal connection existed between the protected activity or injury and the termination. The Court has adopted a burden-shifting approach to analyze cases involving retaliatory discharge based on discrimination.