Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

According to Backes, the Dallas police decided on McWatters' bus as the one Oswald rode. So, they went to the bus company and got access to McWatters' bus, and they issued themselves a transfer ticket, since McWatters' punch was handy. 

Then, at 6:00, they grabbed McWatters' as he passed City Hall, and they said:

Sims: Look, Cecil: Lee Harvey Oswald got on your bus about 12:40 today, and he rode with you for a couple of blocks, and then he asked you for a transfer ticket, this one, which you gave him, and then he got off. You recall that, don't you?

McWatters: No. I don't know what you're talking about. 

Sims: Look, we're not so much asking you as we are telling you. It happened. We are talking about Lee Harvey Oswald, the killer of President Kennedy; he got on your bus and rode with you for a couple of blocks on Elm Street. Now, confirm it.   

McWatters: How can I confirm it? I've been driving this bus all day, and I don't know what the killer of President Kennedy looks like. And as far as someone getting on my bus and getting off after just two blocks? I can't confirm that for today or any other day. I've been driving a bus for 19 years, and it's not too often that somebody gets off after 2 blocks. 

Sims: Just think, Cecil. Try to recall. Because a lot hinges on this, and we are counting on you. He was a slender young man, 24 years old, white, about 5'9". He got on. He rode for a couple of blocks. Then he got off after you gave him a transfer ticket- this one. 

McWatters: Well, that looks like one of my transfers alright, but I don't remember any man of that description, and I certainly don't remember anyone getting on and off the bus in a two block range. I just can't help you with that.  

Sims: God-damn it, Cecil. We are going to show you a lineup, but you better start thinking about cooperating.

McWatters: I'll look at your lineup, but nobody tells me what I've seen.  

How else could it go if Oswald didn't ride the bus?