Another reason is that the use of rat traps are not as effective as they may seem. Traps are useful for single targets, so they only eliminate one rat, rendering it useless against an infestation of rats. 

Another reason traps aren’t as useful is that rats tend to study their surroundings when rats find an unfamiliar object they tend to steer clear from it rendering the trap useless. If for some reason you are unable to contact a professional on the matter then you are only left with these methods.

1. The first method, though not as effective for the reasons previously mentioned, is the live trap. These traps are set up in the holes by which the rats traverse. This renders them trapped and unable to leave. The downside to this is that it has to be regularly inspected.
2. Another type of trap that can be used are snap traps. They are the cheapest option of killing or trapping a rat. Make sure to acquire the snap trap labelled “rat”. This is due to the fact that small mouse snap traps lack the strength to actually kill the rat, which would result in it inhumanely injuring the rat.
3. The next kind of trap is the bait trap. This type of trap is the usual one you see in cartoons, where bait is set on a trigger plate that will trap the mouse when the weight of the bait is changed.
4. Rodenticides are another way to get rid of rats from your home, but it is highly recommended that only professionals use this substance as misuse or accidents could be a matter of life and death. Rodenticides are the way by which professionals easily get rid of rat infestations.
5. Glue boards are another way by which one can trap rats, though this method is ineffective against larger rats because large rats can simply free themselves from it with little effort.

Another important thing that most people forget when they capture a rat is what to do with it when it is captured. The best thing to do when you capture the rat is to either humanely kill it, or release it in an area where it can do no harm to anyone. It is never good to play around or savagely dispatch the rat, even if it has done damage to your home. The rat is still another living thing that can feel pain, and despite how much damage it has done to your home, it is not worth making it suffer. Make sure that, while the rat is in your possession, you keep it at a distance because a single rat bite can cause a lot of possible infections and diseases.