Do you hear scampering and scratching sounds in the walls of your home at night? Have you found droppings and urine?
If that is the case, it could mean you have an infestation of rats or mice. Tackle the problem of occasional invaders right away to avoid a severe infestation.
Health Canada provides information to help you with keeping them out of your home and tips on how to control them.
To find out which companies received warnings, sanctions or penalties by Health Canada for violations of the Pest Control Products Act and the Pest Control Products Regulations: http://www.hc-sc.gc.ca/cps-spc/pest/part/protect-proteger/compli-conform/enforcement-bulletins-loi-eng.php