You can’t bring more than 3.4 ounces of shampoo in your carry-on bag onto a commercial airplane. Or a gun. But too many travelers at Pittsburgh International Airport have forgotten the ‘no guns in your carry-on rule’ and now, officials there are cracking down. Transportation Security Administration (TSA) workers have found 27 firearms at the security checkpoint so far in 2021. “Unfortunately, it appears that 2021 will be a record-breaking year for the number of guns found in passengers’ carry-on bags at our airport. This is not the kind of record we aspire to break,” Pennsylvania’s Acting United States Attorney Steve Kaufman said at a press conference this week at the airport, hosted by the TSA. “Almost inevitably, the passenger being interviewed claims that they forgot that the gun was in their bag and no criminal charges are filed. Nevertheless, bringing guns to the checkpoint is completely unacceptable and poses …