"Intelligent Design" is observed on a daily basis and is as such a scientific "fact".
See how easy this is?
In fact, intelligent design changes allele frequencies on a daily basis. Does that fact make the ID theory a fact? No, of course not.
So if a school wanted to put a disclaimer in a science book stating that TOID is not a fact but a theory, no one should complain. Of course you don't except ID as a theory because like a lot of folks you live in denial. ID is getting ready to trump Darwin and you refuse to see it just like some folks refuse to see that mutations, selection and adaptation happens. Kind of funny actually.
Second problem: Scientific method goes OBSERVATION to HYPOTHESIS. Intelligent design started with the HYPOTHESIS and picks OBSERVATIONS that support the HYPOTHESIS. Therefore, it is not science.