If it was really that simple to detect addative I'm sure the proffessionals of this industry wouldn't have problems detecting it at the worlds, but if you read any race report from the last 2-3 1/8th worlds you'll soon realise that the addative can't be tech'd without a complex machine.
In my very limited experience of foam tires, they generate a lot of black dust when they wear (regardless of addative), this has to go somewhere and be cleaned up by someone, another job for them very few club volunteers.
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Yokomo - LMR
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