You make it sound as though passing a law against has huge resources involved. Since we all agree murder is bad, there isn't any argument or lobbying and a ban

You make it sound as though passing a law against has huge resources involved. Since we all agree murder is bad, there isn't any argument or lobbying and a ban on murder and the law is simply passed. Even the investigation techniques can largely come from other similar crimes, fingerprints, DNA, asking questions are all reusable from other crimes. Some are unique, but not a huge cost compared to drugs. Then there is the huge investment in thing that only catch people with drugs. Drug sniffing dogs, housing for literally millions of non-violent offenders, training on finding drugs. In addition to the victim which others have commented on this is an extremely poor analogy.