But for charges to actually be filed, you would think the police have a pretty good case against him.
Disclaimer #1: I have not reviewed Lewis's file, and I do not know the procedural steps taken up to his arrest (i.e., whether it was submitted to the grand jury before a warrant was issued, etc.).
Disclaimer #2: I am a lawyer, but I do not regularly practice criminal law, so I have a limited familiarity with the general procedure in Ohio, and no familiarity with the customs and practices of Fairfield County.
That being said, I have spent a fair amount of time around courthouses, around judges, around prosecutors, and around law enforcement officials. My general impression: Police will act as soon as they feel they have sufficient grounds for an arrest warrant (which are not even remotely near sufficient for conviction....for instance, an anonymous witness can be grounds for a warrant, but not conviction.). Then they leave it to the prosecutors to determine whether or not to proceed.
So, in this case (PURE SPECULATION BECAUSE I HAVE NOT READ THE FILE), it would not surprise me if the girl reported the rapes, the police got their warrant and made their arrest, and now the prosecutors are reviewing to determine whether there is enough evidence to get beyond reasonable doubt.