It's not criminal law, so there's no need for proof beyond a reasonable doubt. The burden is on the company to show that their interview process was in complian

It's not criminal law, so there's no need for proof beyond a reasonable doubt. The burden is on the company to show that their interview process was in compliance e.g. with training material and documented feedback regarding the interview. A legit company would have no problem with that. It's enough to say: I am an employee with children, I was asked about how my family obligations might affect how I would perform on the job, I was not given an offer because I was unfairly discriminated against.