Been measured with the laser gun!

Hello together, I’m new here and I have a really stupid question, but I’m really thinking about what’s going on now! Been flashed by laser gun about 2 weeks ago and the gentlemen from the police said to me that I drove 74 km/h, minus 3 km/h therefore 71 km/h! The problem is, the track is a bit curvy and on both sides with trees and I find that there a measurement can not be made reasonable or exact. In front of me was a car, about 20 Abs tand and this was much faster than me! By the way, 4 cars came up against me and they also drove too fast, can it be that the value was measured? Since I am still in the probation period, this gave me a great re-training, which is however very expensive! I am legal protection insurance and wanted to ask how my chances stand! In the plant the route is to be seen, the red point I am (inverted measuring point) and the black one the B I would be delighted to receive a quick help from you! Greeting Timo