Instead they're just dumping them on the streets where the rats find them, and the rodents are tucking in whenever they choose.
Fact File
Rat facts
Female rats are pregnant for three weeks
Rats live for 18 months
They weigh about the same as a bag of sugar
Rats have no bellybuttons
Rats can't be sick
They've got so much food to choose from that the poison normally used to kill them isn't working any more.
The number of rats in Britain has gone up by almost a quarter in the last two years and with 60 million of them now living in the UK, there are almost as many as rats as people.