Why are Law enforcement agents against the War On Drugs?

Well they have it pretty spot on with the legalization, regulation, and taxation part. The reason being that legalization of some drugs allows us to let go prison populations of non violent drug offenders. Freeing up tons of space and money used to house and feed these non violent prisoners. Regulation and taxation allow the government to control the amount of drugs and their potency. The taxation would bring in the money to support this system. Basically they are saying that we have lost the war on drugs, there is no way to win or keep it out of our country. This system would keep it under control and allow them to make money off of regulated drug use. Also would eliminate the need for drugs coming across the Mexican border which can help defeat the drug cartels.