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I've only came across one place that won't allow you to run Fog/Haze...
One of the band I was working with had brought in a fog machine, the trigger button got stuck and it set the smoke alarm off which then called the fire department. So they don't allow bands to use any kind of smoke making machines.[/quote]
After using fog for the last 10 years this just happened to me for the first time about a month ago. 20 seconds into the first song, they made us evacuate the building. We were on the 3rd floor of a city hall building in a auditorium. Picture the intro to Seperate Ways by Journey with a loud alarm over the top. Too funny. Then we had to stand outside in 80's stage clothes while they checked the building. I tested the fog too at soundcheck to position the scanners and nothing happened. So needless to say we ask now before we turn it on!