We are tho. Because of the margin of error.We're not though are we?
Arguably the system is not accurate enough to make calls on offsides where the measurement is showing a 1 or 2mm difference.
In those cases you might as well toss a coin. The system isn't capable of making such minute determinations with 100% accuracy.
Even the size of the pixels on the screen the operator is viewing could make a difference to the decision. He could place his marker incorrectly by 1 or 2 pixels, causing the system to change from offside to onside or vice versa.
That's why I say we're treating a 95% accurate system with the authority of an infallible system.
The operator never says, "I can't be sure of this decision. It's too close to call."
Because the operator never says this, the margin of error is not being taken into account. Thus the system is being treated as 100% accurate.