It was revealed this week that many government information officers block specific journalists they don't like from accessing information. The news comes as 47 federal inspectors general sent a letter to lawmakers criticizing serious limitations on access to records" that they say have "impeded" their oversight work. The data about public information officers was compiled over the past few years by Kennesaw State University professor Carolyn Carlson. Her surveys found that 4 in 10 public information officers say "there are specific reporters they will not allow their staff to talk to due to problems with their stories in the past." Carlson has conducted surveys of journalists and public information officers since 2012. In her most recent survey of 445 working journalists, four out of five reported that "their interviews must be approved" by government information officers, and "more than half of the reporters said they had actually been prohibited from interviewing [government] employees at least some of the time by public information officers." The Associated Press reported earlier this year that in 2013 "the government cited national security to withhold information a record 8,496 times - a 57 percent increase over a year earlier and more than double Obama's first year." This week's letter from more than half of the federal government's inspectors general [said] that government agencies' move to hide information from them represents a "potentially serious challenge to the authority of every Inspector General and our ability to conduct our work thoroughly, independently, and in a timely manner."