CHICAGO (CBS) — The City Council’s embattled Inspector General says workers in nearly half of Chicago’s aldermanic offices have been caught doing political work on the taxpayer’s time.

WBBM Political Editor Craig Dellimore reports he is not naming names, but legislative inspector general Faisal Khan says his office found 68 City Council employees in 24 ward offices potentially political doing work on city time. It is mostly challenging opponents’ petition signatures in the 2011 and 2012 elections.

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“Of those 68 City Council employees that were identified as potentially engaging in prohibitive political activity on city time, we were able to conclude at least 18 beyond a preponderance of the evidence did in fact violate the law,” Khan said.

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As for the others, Khan says there aren’t enough records.

“The city in fact has no secondary timekeeping mechanism in place for City Council employees,” he said.

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Several aldermen have refused to cooperate with the IG and haven’t given his office much money. Khan is suing over the funding.