To believe this, you have to assume that the reporting on fentanyl smuggling by the DEA and CBP and the fentanyl convictions data from the USSC that all point to US citizen being responsible for bringing in fentanyl in to the US is insufficient because "we don't know the undetected trafficking rate is in each location". It's possible that we missed this one immigrant carrying by themself 51% of the fentanyl brought into the US, so lets put the blame on immigrants.