Also testing a powder / pill shaving doesn't necessarily mean that a speck sized grain of fent didn't make it into the bag somewhere. But hey at least there's mushies still. Stay safe kids.

Some testing services exist in some countries that can do better than just a reagent test.

yes, but fentanyl is usually unwanted and is much more dangerous than the others (due to wildly varying potencies). Some shelters have been handing out fentanyl test strips - fentanyl contamination has dramatically increased the number of fatalities among opioid users

Whatever drug you are taking, you would test for fentanyl (usually 5 or so reagents are used). This would have saved this guys life.