From this article https://www.businessinsider.com/former-biden-staffer-tara-reade-files-sexual-assault-complaint-2020-4
A woman who accused Democratic presidential candidate Joe Biden of sexually assaulting her when she worked for him in 1993 has filed a formal criminal complaint with the Washington, DC, police about the alleged incident, Business Insider has learned. [...] The statute of limitations for the alleged assault has passed.
Is that really the case? As I understand it, the DC Sexual Abuse Statute of Limitations Amendment Act (passed January 23, 2019) removed the statute of limitations on sexual assault in Washington, D.C. and added a revival period. The most concise explanation I could find was here https://www.chaikinandsherman.com/blog/2019/january/dc-lawmakers-sign-sexual-abuse-amendment-act-to-/
2-year revival period – In addition to extending the SOL for civil sex abuse claims, the Act also creates a 2-year “revival period” for claims that have already expired under the old statute of limitations. That means there is now a 2-year window in which victims can bring previously barred claims now allowed under the new statute of limitations.