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If you work in a small team of people and you discover that someone has been stealing from the company is it right to tell the employer even if you know the person will lose his job.
If the person who stole the money is desparate and on the verge of bankrupcy and will lose his home and family.

Are you in a position that you could talk directly to this person about this situation and find some way of helping them to find a better solution that didn't have such potentially negative consequences for them than the path that they have chosen?