You should speak to your defense attorney about challenging the civil forfeiture of your cash. You can possibly get this money returned, but not without asking. Have your attorney do it on your behalf so you can refrain from making any statements that can later be used against you.
Unfortunately, when the police take money from an individual that later becomes a defendant, there are various sections in the law that allows them to forfeit (take) your money. If they are going to attempt to take it they will have to send you notice and allow you time to claim those funds. In the case of a forfeiture because the police claim "its drug money" you can defend yourself by providing information about the source of the money they are attempting to take ie. your employment, gift, ssi/disability etc.
You should consult an attorney about the possibility of fighting the forfeiture...also if they cannot prove the underlying case it will make it harder/impossible for them to take the money...but you will need to fight long and hard to get the money back.