PD Bullet is Bullet Proof

Description:
The rear window of the PD Bullet is bulletproof, you can smash out the glass but there is an invisible window behind it that you cannot shoot through.

Reproduction Steps:
1. Get a PD Bullet
2. Shootout the back glass
3. Try to shoot the driver

Expected Behaviour:
Driver takes damage

Actual behaviour:
Bullets do not get through the window / damage driver.