The phrase "detectable effect" means that something can be noticed or observed with the help of technology or scientific methods. It refers to a noticeable or measurable impact or change that can be identified or detected. Full definition
«I think this is a very important paper that gives evidence that compounds like BPA and BPS have very detectable effects at low dosages on developing vertebrates,» said George Bittner, a professor of neurobiology and pharmacology at the University of Texas at Austin. (washingtonpost.com)
In contrast, following its first year of implementation, IMPACT had no statistically detectable effect on teacher retention or performance. (educationnext.org)
«What we instead learn,» she continued, «is that Neanderthal DNA that is present in people today has detectable effects on behavior. (seeker.com)