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How has the US government’s use of counterterrorism sting operations changed over the past quarter-century? Have major terrorist attacks led to more frequent sting operations and/or more frequent entrapment – and if so, have such changes been temporary or longlasting? Have different types of terrorism provoked different reactions? This study answers these questions using a database of US terrorism prosecutions occurring between 1989 and 2014, each coded for 20 indicators of entrapment. We analyse temporal trends, and in particular, compare the government’s responses to the 1995 Oklahoma City bombing and the 9/11 terror attacks. Results indicate that after the Oklahoma City bombing, the number of sting operations against right-wing extremists doubled, while the average number of entrapment indicators dropped. This suggests that authorities in the 1990s responded to the growing threat of right-wing terrorism appropriately: conducting more investigations while avoiding entrapment. After 9/11, sting operations against suspected jihadi terrorists rapidly increased, but in this case, they featured high numbers of entrapment indicators through the end of the study period, suggesting widespread and persistent entrapment. Reasons for this difference, and for the government’s failure to reduce entrapment in response to widespread criticism over the past decade, are analysed