If the manufacturers got the pill dimensions right (easily found online) they would likely come out weighting almost the same as the originals. The weighting method may be useful for low quality counterfeits, but I don't think it's reliable enough (unless you had an accurate mg scale and knew the exact mass of the real pill). One may say it's better than nothing, but it can provide a false sense of security which may lead to very dangerous situations (even resulting in overdose and death).
How much is the original version of the pill supposed to weight anyway? If I'm not mistaken, brand name Roxicodone from Mallinckrodt are supposed to weight 135mg each, but those have a different imprint ("54 199" instead of "M30"). As I mentioned in one of my previous posts, real "M30"s are generics.
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Could you save a small piece until you manage to get a test kit? I think it's important (and nice) to have some sort of closure.
I believe this will be a useful "case study" showing how important it is to test your drugs, but especially opioid-containing pills. One should always proceed with caution when consuming these kinds of pills, no matter how real they may look.
And if it ends up being the real deal, well... At least we will know unicorns exist.
It may be obvious to some but it can't hurt to say it for anyone that may be reading this. Make sure you actually follow the instructions of the test kit/stips/reagent, otherwise it could easily result in a either a false negative or a false positive.
Moreover, most fentanyl tests are unable to detect other powerful opioids such as brorphine, etonitrazene (and its derivatives),etc... One shouldn't automatically assume that the pill must be legit just because it tested negative on one test.