Think this will blow over when it really gets looked at ... from race meetings, where you get checked every morning before the meeting starts and if you seem dodgy, any time the clerk fancies ... the parameters for doing a noise check that will stand up even in those tightly controlled circumstances are detailed. How you arrange that in the wild in a way to stand up in court probably only exists as a dream of those hoping to make a mint out of selling the equipment.
John .... 'pops and bangs' ..... by their uncontrolled nature I can't say I've heard any 'quiet' ones! 🙂
K