I guess the idea of ID being taught would take place where unverifiable theories are concerned. Personally, I think the theory of evolution(having matured) has lost favor as the answer to life's origin. I say this, in the sense where life equals matter and not as in organic life(as it were).
Picking off the top of the pile, I would use the big bang theory as an example. In a case such as this, the general consensus is that all thing originated from a single point. However, few if any teachers will discuss the possibilities that the big bang was planned of endued by a force other than... unknown randomness supported by yet more unknown randomness and so on and so forth.