Rule is in disscusion (sorta) on the MECA forum.
As of right now, you pull up to the mic....you get out....and you do your music "run" for 30 seconds and you get an average SPL score of that time allotment.
It really shouldnt be called drive by anymore, but im sure it will stick for now. I think this whole thing stemmed from people getting run over entirely or getting their feet run over during people's runs. The modification to the rules was a "tweak" as far as MECA is concerned for saftey reasons.
allthough, no rules were supposed to be changed for 3 years since they banned the Maxi fuses last year.... but whatever.
There is has been a moderate backlash to the rule / operational change with some people & teams quitting MECA alltogether. Similar happened when the MAXI rule went into effect.