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It is not illegal for a non-profit to have paid employees who go around making inspections for ADA compliance. If violations are found, the non-profit can bring suit for violations and seek attorney's fees. The credibility of the employee would be suspect if they are being paid to go out and find violations, so the violations need to be actual major violations and not minor ADA violations which would portray the non-profit as simply seeking money and not really out for the better compliance with the ADA. Also, the non-profit would need to send a letter to violators giving them a reasonable opportunity to remedy the violation befor running to court and suing, because you have to give them a chance to cure the violations.
It is not illegal to go out and do what you are proposing and there are organizations that do this on a limited basis already.
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