A family member will lie and hide firearms for the accused. The police will steal them (see drug war confiscation practices).

The only possible way I’m seeing for this to work is if a neutral third party - specifically licensed, insured/bonded, FFL - was used to hold the firearms during the adjudication process. If the defendant is found to be sane/innocent, then the fire arms are returned. If the defendant is found to not be sane or guilty, then the firearms are sold for true fair market value and the proceeds returned to the owner. Only a small fee - less than 5% of the gross selling price - allowed.

This might work instead.