So it really doesn’t seem likely that Dibny will be gung ho about Joe using the same illegal plan in order to save Barry.
And when Dibny is the one holding all the morals in any given situation, you know something is screwed up.
The second relevant issue here is that Joe is with Dibny during this evidence-planting mission, and if there’s anyone that Joe should have avoided teaming with in this instance, it’s Team Flash’s stretchiest member.
After all, Dibny has his own history with planting a faux murder weapon at a crime scene, and him getting kicked off the police force is what started the strife between him and Barry.