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I don't have a clue to what the poison was, but can imagine seeing this in use again and not always on horses.

It doesn't even have to be a poison. It can be just a fast acting drug that slightly inhibits the oxygenation process of the blood. It needs to go to work instantly and stop working in less than three minutes.
Who ever figured this one out was pretty bright with a big knowledge of both drugs and electronics. The instant I read the article I saw how it worked but I have never heard of this scam before. They usually only test the winning horses. Unless the handicappers they were using were idiots it could have continued undetected for a long time. I would guess they were using computers to figure the new odds. They got caught because whoever set up the hardware got careless. I'll bet the hands on guys that buried the delivery system weren't the ones with the brains in this operation.