Hi Larry,
 
Most research, even the best Multiple Baseline Design or the tightest Solomon four group design will have some flaws. Even a novice can spot them. Imagine what a Frank Gresham could do. I could no doubt find some flaws in L-Carnosine research if I looked. Also a blind, control-grouped study may be totally inappropriate to your specific independent variable. This design logic makes sense in medicinal research and is depending on how it is actually used, a very strong design.

You wrote “Show me an ABA study with even a control group...”

(Lovaas, 1987; Smith, Groen, & Wynn, 2000; Eikseth, Smith, & Jahr, 2002) to name a few. All being discrete-trial research having control groups and quasi-random or random assignment.

Since the majority of ABA autism research is published in behaviorist journals which typically encourage single subject designs as opposed to group design logic, we see much more research occurring in this sort of format. This method is no less accurate provided it is done with a design logic that shows experimental control. The various virtues of the two design types are discussed elsewhere so I will not go into it here.

This is a very, very short list of single subject ABA research including some PRT and Incidental teaching, since you said “ABA”.

(Grindle, & Remington, 2002; Sigafoos, & Saggers, 1995; Newman, Needelman, & Reinecke, 2002; Woods, 1987; Koegel, & Carter, 2003; Weiss, & Harris, 2001; Kok, Kong, & Tan, 2002)

Also, this is some research where DTT is directly compared to other ABA methods.
 
(Delprato, 2001; Miranda-Linne, & Melin 1992; Charlop-Christy, &Carpenter, 2000)

I restricted this to peer reviewed journals and only used DTT, PRT, and Incidental Teaching. And even then I didn’t even try to put in everything. Just to give you a rough idea on ABA’s research base, a student I know just completed a review of all research articles in the Journal of Applied Behavior Analysis (perhaps ABA’s flagship journal). She found over 900 studies. Many of these include persons with developmental disabilities including autism. And this is only one journal…