Anyone who even remotely understands the opioid/fentanyl issue knows that lacing drugs with other drugs is a time honored thing. Less addictive drugs are COMMONLY laced with addictive drugs in order to maintain the need chain.
Fentanyl is addictive and deadly. Make no mistake, you risk your life counting on some drug dealers chemistry abilities when consuming any street drug.
The amount of fentanyl required to adulterate illegal drugs effectively, and potentially deadly, is minuscule. A salt grain sized particle is sufficient to wipe out you and your family if ingested.
Do not believe that there are safe levels of illegal fentanyl, do not believe that test strips will tell you whether or not fentanyl is present in any drugs you buy off the street. There are forms of fentanyl that defy generally available test regimes.
Methadone treatment centers are required to do urine tests on program participants, at least in my state, and they CONSISTENTLY come back positive for fentanyl. The participants CONSISTENTLY claim they only used pot, would never use fentanyl.
Dont trust sources whose agendas may not align with your best interests. Get information from professional sources.