Non-poisonous way to deal with rats

VERA Treacy (Letters, May 15) raises the issue of poisoning rodents.

There is no justification for the sale of poisons in supermarkets alongside foodstuffs for casual and uncontrolled use.

Accidental poisoning of pets is common; there is a risk to children and a risk of accidental contamination of food, as well as occasional malicious poisonings.