A more thorough explanation:

EX CAPITE

Ex capite is a Latin term that means "on the ground of" or "by reason of".

1. The company fired the employee ex capite of poor performance.

2. The athlete was disqualified ex capite of using performance-enhancing drugs.

The first example shows that the employee was fired because of their poor performance, which is the reason for their termination. The second example illustrates that the athlete was disqualified from the competition because they used performance-enhancing drugs, which is the ground for their disqualification.