Jussie Smollett is now officially in the crosshairs of law enforcement, because Chicago PD said he's now "officially classified as a suspect in a criminal investigation ... for filing a false police report." The cops say detectives are currently presenting evidence to a Cook County Grand Jury. If Smollett is charged the felony carries a maximum 3-year prison sentence. We're told the 2 brothers are at the courthouse now and are expected to testify ... most probably today.