Intelligent design theory can thus be empirically studied because it does make predictions .. For example, if large measures of intelligent cause were inserted into the biological realm, one might expect to find record of rapid change in the history of life, as is thought to be found in the fossil record. Tied closely to specified complexity, one might expect to find highly complex biological structures which defy a mechanistic causal explanation. Thus, intelligent design and evolutionary theory are competing hypotheses which make different predictions. Evolutionary theory predicts that the biological structures we find must be evolvable in a step-wise fashion, while Intelligent Design theory predicts that it is possible that highly complex unevolvable structures might exist.
Many scientific or intellectual endeavors already detect and infer Design:
Copyright and patent offices identify theft of intellectual property
Insurance companies prevent themselves from getting ripped off
Detectives employ circumstantial evidence to incriminate a guilty party
Forensic scientists are able to reliably to place individuals at the scene of a crime
Skeptics debunk the claims of parapsychologists
Scientists identify cases of data falsification
NASA's SETI program seeks to detect intelligence identify the presence of extra- terrestrial life, and
Statisticians and computer scientists distinguish random from non-random strings of digits.
We already see and understand how intelligence operates in the natural world, and we know how to recognize the products of intelligence. Why can't design be applied in biology?
A number of complex interacting parts intuitively sparks notions of design, so why not follow that intuition and allow investigation into notions of design in biological origins?
This is, of course, false. Whoever you quoted from didn't do a very good job of researching things.
There are no predictions above other than those that are the same as ordinary biology predicts. What would distinguish ID from ordinary biological predictions? Just creating another (and more complex) theory that predicts the same things isn't very interesting.