Just an FYI - Social Security disability checks are all on direct deposit now unless there is a special circumstance where the person can't get a bank account or debit card to load the deposits onto.
Social Security has its own debit card. If you do not have a checking or savings account that your SS check can be deposited in, SS opens you a debit card where your monthly check is deposited. It works just like a bank debit card with the exception you can not make any deposits into it, only withdrawals.