I pinged Wiki on this and interestingly enough it says Nixon signed the Drug Enforcement Administration (DEA) into being in 1973. Thus, if true, I'd still argue that we have a non-liberal as the genesis of this problem. Things that make you go hmmm. Though, wait, if the FBI was tasked to enforce these laws before the DEA got them, then, hmmm.
Would not the elimination of the "no knock" warrant go a long way to fixing this problem?
What I would like to see would be a recognition of juries' legitimate role in deciding "reasonableness". If twelve ordinary people would conclude that the manner in which a search was conducted in a particular case was not reasonable, the search should be legally regarded as unreasonable and therefore (per Article VI) illegitimate.
Defendants need to be allowed to have juries informed about the background and execution of searches, and told that they should regard as illegitimate any search that was not reasonable, along with any evidence from such a search. If juries were so informed, policemen who wanted to win their cases would have to refrain from SWAT tactics except in cases where a reasonable person would judge them appropriate.