“I dont follow”
The only thing you should worry about following is the psak of your Rav.
I will try to be clearer. In short, if “rabbi” shirley temple certifies something as kosher, I can be sued for slander by stating it is not kosher (tip: try calling the OU, OK, star-K or any well known kashrus agency and ask them if “supervision X is reliable”). The law does not recognize or accept as kosher, (for example) the CRC standard of kashrus any more then it does hers. If she claims it is kosher all she must do it show that she supervises to her standard of “kashrus” and you cant claim it is not “kosher” under the law. The law will not decide whose standard of kashrus is correct (nor do we want them getting involved either).