Imagine that, having a gun can get you shot. Who would have thought!!!! One link is from 2009 and the other seems to have nothing to do with your argument.
So, you want the taxi driver to inform them that they might have a concealed weapon? Here is some research for you
http://money.cnn.com/gallery/pf/2012...s-jobs/10.html
http://www.redeyechicago.com/news/lo...929-story.html
http://dangerousjobsguide.com/home/d...bs/taxi-driver - more recent then your study showing the job as the 8th most dangerous job in america
https://www.osha.gov/Publications/ta...-factsheet.pdf - Goverment site saying that they are 20times more likely to be killed on the job
Statistics about how many lifes guns save
https://www.gunowners.org/sk0802htm.htm
http://www.nap.edu/openbook.php?record_id=18319&page=16 - Government ordered study showing that those who used a gun in self defense were Less Likely to be harmed
http://akdart.com/gun3.html - Long list of times where guns saved lifes
There are some "statistics". Let me know when You put the facts together and realize that not only do taxi drivers have a Very obvious reason to have guns, but guns do more good then harm. In this instance, it saved dozens of lifes.
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Nor do the taxi drivers. Why should they inform a potential thief or killer that they are packing. What does that do other then get them shot without so much of a chance at self defense.