How about …
	•  …Researchers [in a study conducted in mid- 1990s] enticed landlords to recruit 108 families with healthy children to live in row houses with varying degrees of lead contamination to measure the effectiveness of lead-abatement projects in the city’s poor areas. The parents say they didn’t know the row houses had lead paint, and were told too late by the researchers that their children were being put at risk. » Boston Globe (9/3/2001, p. 1)