The answer to 'how did pest prevention get in my house' is that pests can find their way into your home through a variety of entry points, such as cracks, gaps, and openings around windows, doors, pipes, and vents. Common signs of a pest problem include droppings, nests, chewed materials, and visible insects or rodents.
To prevent pests from getting in, it's important to seal up any potential entry points by caulking, weatherstripping, and installing screens. You should also eliminate sources of food, water, and shelter that can attract pests. If the problem persists or you notice a significant infestation, it's best to call a professional pest control technician who can identify the specific pests and implement an effective treatment plan.