>> The warrant stated that: "the optical detector in the detector van uses a large lens to collect that light and focus it on to an especially sensitive device, which converts fluctuating light signals into electrical signals, which can be electronically analysed.

This "especially sensitive device, which converts fluctuating light signals into electrical signals" sounds remarkably like the human eye.

Those signals, of course "can be electronically analysed". Emphasis on "can". Equivalently, "could".