WASHINGTON — Lawmakers have unleashed more than $5 trillion in relief aid over the past year to help businesses and individuals through the pandemic downturn. But the scale of that effort is placing serious strain on a patchwork oversight network created to ferret out waste and fraud.The Biden administration has taken steps to improve accountability and oversight safeguards spurned by the Trump administration, including more detailed and frequent reporting requirements for those receiving funds. But policing the money has been complicated by long-running turf battles; the lack of a centralized, fully functional system to track how funds are being spent; and …
