Found this on Glock Talk:
can't confirm it's accuracy.
PA State Police may go 45 acp
Pulled over today for DOT check and when finished got on the subject of Glocks which they have G 37 in the Gap. The officer said they are testing G21 in 45acp right now . and he did not care for the old Beretta 40 cal they had . The officer was courteous .Every thing was good on my spot check.
can't confirm it's accuracy.