Gov. Scott Walker of Wisconsin, who gave up his quest for the 2016 Republican presidential nomination last month, signed into law on Friday a measure that limits a longstanding tool against political corruption that has been used in investigations of Mr. Walker and his allies.
The John Doe law, as it is called in Wisconsin, has given prosecutors the power to obtain search warrants and order people to testify and turn over documents in investigations that typically take place in secret. Continue…
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