Steps in proving guilt in an assaut case:
1. The actions of the defendant were carried out intentionally.
-The man clearly knew that the substance he was throwing would impact police officers. The merit behind his intentions are irrelevant, all that must be proven is that for whatever reason he willingly threw the substance at another person.
2. The plaintiff/prosecution did not consent to be subject to the acts of the defense.
-The police officers in no way consented to have this substance thrown at them. The only fault in this aspect of the process is that the police officers cannot file for a CIVIL case as regulation prohibits them from doing so, otherwise officers could sue anyone who attacks them, and the courts have ruled that such law suits would inhibit criminal case proceedings. But as for criminal law, this restriction holds no bar. The state is free to prosecute for assault and give punishment as it sees fit (which will be hefty seeing as DA's don't take kindly to assault of a police officer).
3. The actions of the defendant must be proven to HAVE THE POTENTIAL to be harmful or offensive on the standard of a reasonable person.
-This is where (I think) we're having the most disagreement. My argument, and what I'm pretty sure the prosecution will argue, is that there is some existing scenario where the substance the defense threw at the officers could have caused any of the officers bodily harm. Burden of proof is always an issue in cases, but it's not hard to fulfill that obligation in cases that rely on how the prosecution interprets the actions of the defendant. As for the reasonable person standard, this usually comes down to the jury pool. If I were on this case, I think the prosecution would have an easy time finding a convincing scenario where there was the potential for harm. Remember, the case doesn't revolve around the potential of fake blood to cause harm, but rather on the potential for any red substance to cause bodily harm.