Can an Air conditioning system leak into the car?

Can an Air conditioning system leak into the car?
Because there is a transfer of heat through the evaporator coils inside the conditioned air box inside the vehicle, there is a tendency to create condensation on the coils. This condensation is usually channeled off to the out side of the car via a drain path or hose. If the drain path is blocked, the moisture could build up inside the conditioned air box and leak. Also if a drain hose has been disconnected, this could also lead to a leak inside the vehicle.BTW, I have also seen interior fluid (radiator) leaks from the heater coil due to failed coil assy.