Opinion Piece: The Change of legislation Regarding the Use of Rodenticides

Opinion Piece: 
The Change of legislation Regarding the Use of Rodenticides. 
The use of rodenticides is both an inefficient and unethical way of reducing rat populations on the farm. Recently there has been the implementation of some key changes in the legislation regarding the safe use of rodenticides.
As of the 31st of March 2017 in order to comply with these changes you must have completed an approved training programme before purchasing professional grade rat poisons.
With little time that can be described as 'free' for the average farm owner, the idea of sitting down and enrolling in a training program doesn't seem the most compelling. Nor does the option of having to pay the large bill for a professional pest control company to make regular visits to your property.
 
As well as the inconvenience created by this change in the law, the ethics of using rodenticides should also be considered.
The affects of Poison on the Rodents: 
It can take anywhere between twelve hours and five days for the rat to die after ingesting a high enough dose. In my opinion, it is the cruelest way of dispatching of rats.
When looking deeper into the ethics of using these products it is clear they have a huge detrimental affect on local wildlife.
After the rat has spent four days excruciatingly dying it will look like a very inviting meal for a whole host of predatory birds, including barn owls, buzzards and Kites.
After picking up the carcass of the rat and eating it the animal in question will be affected in some way by the poison. Irrespective of how quickly the compounds is broken down.
So it seem that missing the target species is another shortfall of using rodenticides as a way of controlling rat populations on farms and indeed at home.
With a variety of alternatives on the market, including the GoodNature A24, which seem to be far less time consuming and far more ethical, why would you still use rodenticides?