I doubt it. Mainly because, theft losses are disallowed starting in 2018 as a result of the tax reform law, unless they are a result of a federally declared disaster (like a hurricane).
Ponzi schemes are complicated because it is not always easy to determine the timing or amount of the loss. Because of the tax reform law, you would have to deduct your losses on an amended 2017 or earlier return, and I don't know if that is allowed. You should consult a professional tax accountant.
