There was a lack of scrupulous checking somewhere along that line, and an attacker seized upon this and used it as a route to inject some very nasty malware onto our site.

He has stayed up with his eye on the weather, just as he has stayed up half the night every night preparing and checking our itinerary and route.

The polling robot has to go past all the checking points and return to initial location along the shortest route. As you know, this is Traveling Salesman Problem (TSP).