Can a person be found liable as an aider and abettor of a crime if they were "concerned" in the commission of the crime?

8 In People v. Nguyen, supra, 21 Cal.App.4th at page 529, 26 Cal.Rptr.2d 323, the court explained, "[T]he law imposes criminal liability upon all persons 'concerned' in the commission of a crime. ( 31.) As a legal standard this provision creates what may be considered a 'bright line' rule. If a person is 'concerned' in the commission of a crime then he is guilty of that crime without assessment of the degree of his involvement otherwise. 'Liability attaches to anyone "concerned," however slight such concern may be, for the law establishes no degree of the concern required to fix liability as a principal.' [Citations.] A person is 'concerned' and hence guilty as an aider and abettor if, with the requisite state of mind, that person in any way, directly or indirectly, aided the actual perpetrator by acts or encouraged the perpetrator by words or gestures. [Citations.]"