From a vet nurse:

So, I came into work today for my 14 hour night shift and it’s pretty quiet so far, thankfully. The vet that was heading out was giving rounds. She brings me to a kennel with a towel over it and says that this bengal cat came in for stryknin poisoning and was in critical shape. It was fractious which was indicated by the caution stickers over the kennel. It also showed on her monitoring sheet that she needed hourly vital checks including temps. She indicated that the cat was on IV. I noticed that the fluid was blue, so I asked what the additive was and she told me it was Methelyn blue. So I was checking out the situation and noticed that the fluid pump had been turned off and asked the doctor if there was any reason for this. She said no. So the oncoming vet and I went to the kennel to check things out. We opened the kennel door and then lifted up the blanket cautiously to discover that Elmo was there with a jubular cath placed expertly. We are now looking for a very devious way to get back at the off-going Vet :)