Do you believe you are being discriminated against at work because of your national origin? If so, you will need evidence to back up your claim. The following three tips will help you prove your case in court, if necessary.

1. Keep Notes: Every time there is an incident at work that is offensive or discriminatory, write it down in a log with the date, approximate time and names of everyone involved. For instance, every time your boss tells a racist joke or a company official makes a racially discriminatory statement, jot it down. If you are qualified to receive a promotion, but you are repeatedly turned down for it, keep track of this information, as well.

2. Speak with Coworkers: If you suspect that other employees are also victims of discrimination, ask them about it. Find out whether or not they have faced similar situations as you. Also, ask your coworkers if they have witnessed discriminatory behavior against other workers.

3. Paper Trail: Make copies of every document that include discriminatory comments. For example, if you receive an email that contains a racial slur or other discriminatory statement, print it out and save it. If your workplace has an employee bulletin board, copy or take photos of any racially offensive posts. This may even include taking a photo of a racist cartoon drawn on a napkin in the break room. Just do not copy or use confidential documents you are not entitled to keep.

If you are unsure or want to discuss this issue further, an immigration attorney can help you sort out the facts and determine if you have a legal claim.