Member vs Non-Member

We are a club that allow member and non-members to participate in our programs for tennis.  We are using a kiosk check-in for our 4 pools- which you have to be a member to have access.  The problem we are having is a non-member that has a Court Reserve account- has a bar code and can give the bar code number the check-in staff- once the staff keys in the number- it does not let staff know if it is a member or non-member.  So, for liability purposes on our end- it would be very beneficial for pool staff to know that only members are entering the pools