Welcome to the forum and I am sorry to hear about your experience.
Jamming from the rear is most difficult because of the large amount of perpendicular reflections (from the trunk/boot), the large reflectorized tail lights, the retro-reflective license plate, and the CHMSL. This is a real challenge for any laser jammer, alone.
It's been my experience that the (particularly for the rear) using a combination of active and passive countermeasures working in synergy are the best defense against a rear shot.
While I can't assure you that you can completely eliminate rear targeting punch throughs, I do believe the following products used together would minimize such repeat performances:
- Rear Laser Shifting Head (of your ZR4/9500ci)
- Veil (lightly) coated Photo Blur or Laser Shield
- Veil on the tail lamps
- Veil on the CHMSL
By eliminating reflection of the laser/lidar from all of these areas, your rear laser jammer head will have a much easier time with rear shots.
Remember being farther away from the laser source (with active laser jammers only) doesn't mean it's easier for the jammer to jam.
In fact, we have long observed what I like to call "long-distance" punch through. This can happen when either the power and/or the beam divergence of the laser jammer head is not sufficient to successfully deliver an interference/destructive pulse train to effectively jam the police laser.
Also when you get farther from the laser gun, the beam divergence of the police laser/lidar increases to the point the areas far away from the jammer head (located by the rear number plate) can still be "seen" and measured by the laser gun.
Often times jamming will occur successfully at certain distances and not as well at others.
By combining all of these countermeasures together, leads to what I call, defense-in-depth, and will most certainly maximize your success rates in the future.
The nice thing about the Photo Blur is that when combined with Veil, you will not only get great protection from laser, but also from rear-photo enforcement like red light cameras as well as IR-based photo enforcement systems including ALPRS (license plate scanning systems).
What's really terrific is that this extra protection only costs a nominal amount relative to your active laser jamming system.
Danny from BRD has a great promotional rate on these combined products and is well worth the investment. Laser Veil / Photo Blur Combo
I have had personal success with this kind of setup on my large metallic silver sedan on more than one occasion against rear lidar shots.
I am going to be looking forward to a future post of yours where you found these systems together made the difference.
Keep me posted, please!