"Drugs" is a conflation Police always use because it politically supports their Roadside Drug testing campaign, which focuses on recreational drugs. It's reasonably sophisticated spin on their part, something their spokespeople have clearly been coached on. The conflation is misleading because it implies that Methadone caused this crash, but of course RDT does not test for Methadone, opioids or Benzos (Xanax etc). Yet these drugs along with alcohol cause far more accidents than cannabis, a primary target of RDT.
The police never suggest that something should be done about drivers who are under the influence of these legal drugs – that's off limits even as the "War on Drugs" sticks to its well funded agenda. Result: Most of the preventative resources are poured into the least harmful drugs.
So the Police are not focused on protecting people on the roads, rather prosecuting a political position that attracts major funding to their organisation. It's especially cynical and hypocritical when they exploit tragedies like this crash. Actual statistics about different drugs and crash rates can be seen below here and here: