I guess Hammond would have insisted that Lysine should still be available to them, even though they were loose on the island, against his colleagues advice.
The novel makes it pretty clear that Hammond is a nutjob, who constantly ignores precautionary advice from his experts.
Gennaro expected 12 animals on the island. Hammond bred 200+. Wu wanted to make the dinosaurs more docile and controllable. Hammond insisted that they be wild. Muldoon wanted to be armed to the teeth. Hammond originally insisted on no guns anywhere on the island. Nedry designed a computer system that even Arnold said was excellent, but Hammond made excessive further demands on him that drove him into financial ruin, causing him to accept a bribe from a rival company
They tone Hammond down in the film, but he's still a misguided old tool