The patronage scandal that engulfed the Schools Development Authority two years ago was not an isolated incident of failed leadership, a state watchdog agency has found, but the result of "years of inconsistent and questionable" management and policies that has led to wasteful property management, costly construction overruns and poor practices to weed out bad contractors. If the authority does not enact further reforms, "the public cannot be confidently assured that the SDA can consistently and successfully serve as a capable and trustworthy custodian of public tax dollars" to build schools in New Jersey's poorest districts, the State Commission of Investigation said Wednesday.