I think it means "we have evidences about his crimes in 2019, but we suspect he ...

reisse on Dec 13, 2022 | parent | context | favorite | on: The United States of America vs. Samuel Bankman-Fr...

I think it means "we have evidences about his crimes in 2019, but we suspect he also commited some crimes earlier, and if we'd find additional information in due course, we reserve the right to add it to the charges" in legalspeak.