Seems very clear in this case. Its not that they cannot detect Micera, they certainly can. Roche the drug manufacturer has been working with them directly.

I think my uncertainty with Landis originally resulted from not understanding what drug would explain his results, or why a high testosterone would help that super human effort that day.

If we go back, he tested positive for the very stage he did unreal effort with a result that doesn't necessarily explain that effort. Ricco tested for a drug Micera that has easily explainable results that stays in your system.