Assuming you do not have a contract or a collective bargaining agreement, then you are an at-will employee. As an at-will employee, the employer can let you go for any reason at all, or no reason at all, so long as it is not for an illegal reason like race, sex, age (40+), disability, etc. Without some type of agreement, you do not have extra rights because of your length of time with the company.
Your statement suggests that you were negligent in handling an asset of the company, and allowed (even unknowingly) it to be used illegally. Even if cause were necessary for discharge, that could be considered enough grounds for discharging an employee.
If you belong to a union, contact the union for representation. If you have a contract, check the terms of the contract. If neither of these is true, then legally it may be difficult to get your job back.
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I am sorry to say that you have no case for wrongful termination based on the facts you have recited. Unfair, yes. But it is not wrongful termination, which is a very narrowly defined cause of action that says it is unlawful for an employer to terminate an employee for a reason that is contrary or violative of a fundamental public policy of the state. Essentially, wrongful termination suits relate to terminations that occur because someone has engaged in legally protected activities, or because someone is a member of a protected class of people. Being fired for actions of third persons is not unlawful, just grossly unfair.
I hope your son understands just how grievous his action were. It is a crying shame you had to lose your job over his irresponsible acts.
Good luck to you.
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Although you do not have a case, it may be worth it for you to hire an attorney on a very limited basis to try and explain to your employer what happened in an effort to get your job back. If you are a 15 year employee in good standing with your company I cannot imagine they want to lose you,
This is my opinion and should not be construed as legal advise for your specific case as there are many more facts which you have not provided.