Foxx’s higher rates of dropped cases included people accused of murder, shooting another person, sex crimes, and attacks on police officers — as well as serious drug offenses that for decades have driven much of Chicago’s street violence. For the three-year period analyzed, Foxx’s office dropped 8.1% of homicide cases, compared with 5.3% under Alvarez, and 9.5% of felony sex crime cases; the rate was 6.5% for Alvarez.