Since 9/11, the majority of criminal convictions in high-profile terror cases in the US relied on sting operations. In many, the FBI crossed the line into entrapment, luring penniless men and teenagers into sophisticated plots they never could have dreamed of on their own.
The jury-selection process began Tuesday for four men accused of plotting to plant bombs outside a Bronx synagogue. The defense is likely to focus on the confidential informant in the case.
New York's federal courts have seen many major terrorist trials since the early 1990s, several involving Al Qaeda-linked operatives.
Organized groups are still the main threat, but homegrown jihadists can be very dangerous, too.
Four men planned attacks against Jewish and military targets, according to authorities.