an organized diesel fuel theft scheme in Northwest Florida knew how to use super magnets to get the fuel pump to dispense without counting the gallons

 5 arrested, on felony tampering with a fuel pump.

The guys were caught on surveillance footage filling up multiple semi trucks with diesel fuel.

https://weartv.com/news/local/magnets-used-to-bypass-diesel-pumps-in-northwest-florida-theft-scheme-investigators-say

How the hell did the engineers who designed the pump, not notice that they had ferrous materials, (which are needed to create sparks, and are magnetic) in a part of the pump system where someone could use a super magnet to get free fuel?