Surprise. No difference than any of the other "public service" jobs that have been previously exposed in audits, prison guards, refuse workers, airport security.  All critical functions that the city/state is obliged to provide.  One reason why government is unable to provide these services, efficiently and at the best price is due to collective bargaining and union contracts that are so burdensome, restrictive and abused that the cost becomes something only government would buy.  The private sector could and would never be able to maintain such an abuse and bloated system and survive in a free market.  Workers fully understand and adhere to the status quo and take advantage of everything offered in their benefit package (who is really sick an average of 22 days a year?).  Sadly, there is little accountability in government and that's why our city/state is the way it is.