The U.S. Justice Department has encountered substantial difficulty persuading juries and judges to convict protesters charged with felony assault on federal officers, according to data released late this week showing that most of the 102 individuals arrested across four major American cities last year were not convicted of felony assault charges.

The cases originated from demonstrations that erupted in 2020 following the death of George Floyd during an arrest in Minneapolis. Protesters in Washington, Portland, and other cities clashed with federal officers, leading to a wave of arrests and felony charges.

Legal experts say the outcome stands in sharp contrast to the success rate the department typically achieves in federal assault prosecutions. In ordinary federal criminal cases involving assault on officers, conviction rates are significantly higher than what has materialized in these protest-related cases.

Observers note several factors may explain the discrepancy. Defense attorneys across multiple jurisdictions mounted vigorous challenges, arguing that protest conditions were chaotic and that distinguishing between intentional assaults and incidental contact was often impossible. Several judges also expressed skepticism about the breadth of the charges, with some dismissing cases or pushing prosecutors to reduce charges to misdemeanors.

The results have sparked debate within the legal community about how aggressively federal authorities should pursue felony charges in the context of large-scale demonstrations. Some legal scholars argued the arrests represented an overreach that the justice system ultimately rejected. Others contended that the failure to secure convictions could embolden future disruptions of federal operations.

Prosecutors said they are reviewing how such cases are built in the future, with some internal discussions reportedly underway about standards for charging decisions in protest-related incidents.

Civil rights groups that monitored the proceedings said the outcomes reflected a functioning check on government power, while law enforcement organizations expressed concern about the implications for officer safety.

The data underscores how complex it can be to bring felony assault cases arising from crowded, volatile public demonstrations where evidence is often contested and witness testimony varies widely.