The Bloomberg administration sent settlement notices yesterday to tens of thousands of people who were illegally strip-searched in at least six different New York detention centers between 1999 and 2002. It is the second time in five years that the city has settled a lawsuit because of strip-searches. The latest settlement, which was finalized in May, ends a class-action lawsuit brought on behalf of some 40,000 people, all of whom were arrested for misdemeanor violations, arraigned, and strip-searched as they entered detention centers, including Rikers Island.