The report goes on to say

MI Legalize, one of two committees that started circulating marijuana petitionsthis year, wants to legalize use of the drug by anyone over the age of 21 and tax sales at 10 percent. Local governments would license manufacturing, testing and retail facilities.

The committee will have to collect at least 252,523 valid signatures by June 1 in order to make the November 2016 ballot, and state law generally gives petitioners 180 days to do so.

“The 180-day period is a floating time frame,” said Fred Woodhams, a spokesman for the Michigan Secretary of State. “It is calculated from the day of filing by counting backwards 180 days. Each campaign has to decide on moving forward whether to ‘lose’ signatures from the front end as….

Full Report at: http://www.mlive.com/lansing-news/index.ssf/2015/12/michigan_marijuana_legalizatio_7.html