HB 1977 proposes changes to the Texas Code of Criminal Procedure regarding the admissibility of evidence in sexual assault and related cases. It allows for the inclusion of extraneous offenses or acts in trials involving sexual assault, aggravated sexual assault, or attempts and conspiracies to commit such offenses. The bill broadens the admissibility of prior acts against the victim and expands the scope of applicable offenses. It also ensures that the changes apply to proceedings commenced on or after its effective date of September 1, 2025​.