If this deadly, fast acting military grade poison was on the door handle of the home address, presumably only one of them touched it as they either entered or exited the house and then due to the highly toxic nature of the substance, very easily contaminated the other. Once the hands had been contaminated with the military grade fast acting nerve agent, they then got into the car, drove into town, parked up, walked to the pub, had a pint in the public bar, paid for the drinks, walked to a restaurant, ordered a meal, ate the meal, paid for the meal and then exited the restaurant. All of this involves hands and touching objects such as cash, door handles, glasses, plates, cutlery or even people directly. We are told, that this is the same mechanism of transfer which passed on the contamination from one victim to the other. After all of this, they then fell ill. This must have been some considerable time after initially being contaminated with the military grade nerve agent? A passing Detective Sergeant just happend to be in the area as the couple became ill and as a result of helping them became contaminated with the fast acting highly toxic military grade nerve agent himself. But by some fluke no one else who had contact with them in the street, pub or restaurant was affected. Also, by chance the military grade poison took an extraordinary long time to take affect on the two victims.
One word, bollokcs (had to spell it like that to defeat the naughty word checker). We are being manipulated folks.