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Those that support animal testing say that is a necessary practice. They mention that firms that count on animal testing do use humane techniques to feed, house and care for the animals. Supporters also claim that options to animal testing are certainly not as far reaching, lacking a chance to figure out how cosmetic products affect living tissue and organs. Flickr: Danny O The main objective of the what are known as IR35 legislation is usually to prevent contractors using the tax benefits associated with operating through their very own personal company. This means people working via limited companies would be be subject to the same degrees of tax as 'normal employees', with the appropriate levels of taxes & national insurance.