An exemplary media implementation precipitates a device to perform actions including: determining if an instruction of a line of common intermediate language (CIL) code meets a predetermined exception-related criterion; and if so, injecting a decision point in association with the instruction of the line of CIL code, the decision point enabling a decision as to whether an exception is to be thrown with respect to the instruction. An exemplary device implementation includes: instrumented CIL code that includes a test couplet corresponding to a decision point and an associated instruction, the associated instruction capable of causing a fault; a decision runtime library that is adapted to evaluate the test couplet to selectively decide whether to throw an exception with respect to the associated instruction; and a common language runtime component that interprets the decision point so as to call the decision runtime library prior to executing the associated instruction.