A Jedi can probably sense a giant laser coming right at them and either jump out of the way or if they are skilled with the force, force it back to where it came from. Also, they have had alot of training to be resistant to such injections and poisons. And they would sense those two things and be prepared for them.
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Despite their power, jedi are neither omniscient, omnipotent, nor omnivigilant. Thus, the means suggested by EUIX would most likely work at least some of the time (probably more often than not).