That is actually a great idea, however it is not always straight forward is it.
It has been 46 years since the 1966 world cup final and they still can't decide if Hurst's second goal was over the line or not!!!!

How long can the game continue whilst the video ref watches the replays??

The only way it could work is if it could be like Ice Hockey and something within the ball would set off the alarm once it has crossed the line.

They can put chips into formula 1 cars that, with sensors on the start/finish line, can time laps more accurate than a thousandth of a second, they can also put chips into ice hockey pucks (sp) that can take far more punishment than would ever be inflicted on a football. Combine the chip with sensors and cameras built into the posts/crossbar and you get instant results without the need for human intervention. The technology is all there, IMO it just needs the right technology company to make a big enough offer to the old duffers running FIFA to grant them the license to provide the system.

As for 1966 - if Sky had covered the game with todays technology and their miriad of cameras, then everyone watching would have known for definate one way or the other within seconds.

Only problem with the chip is the whole ball has to cross the line, so the sensor would have to be in the netting just past the post, or they would have to put a few chips in the ball and they'd all have to set the sensor off for it to be a goal. With F1 cars it's easy, just put it at the very front, whilst hockey pucks are small so there's less to travel over the line.

Not really. It's very simple - it's complicated by Stevo constantly talking about the momentum rule. There is no rule per se, but it is referred to in the laws of the game.

In simple terms, technology is not going to help with forward passes for one simple reason; it doesn't matter if the ball travels forward. It matters if the ball is passed forward.

]This is particularly noticeable when a running player makes a high, lobbed pass.

I suppose you could put computer chips in players hands to see if they're passing it forward but that's probably going a bit TOO far. They could use the VR for forward passes but they'd have to educate people on what a forward pass was first.

So attach the sensors to the post/crossbar but position them a few inches behind the line!