It is surprising any exterminator would be using poison INSIDE a domicile. Usually poison is only used for outside purposes. The standard method for low-grade infestations inside is traps. If you poison rodents inside you end up with them dead inside the walls, under the stove, etc. and get the wonderful benefit then of smelling the stench of their rotting corpse. Verrryyyy dumb thing to do aside from exposing your fourlegged family members to the possibility of a horrible death.