In the end the smartphone is quite irrelevant - the detection happens through a color test that should also be visually clear as a purple color. Also, it is a bit impractical because a color test will ruin the drink (hydroxylamine is poisonous and has a strong bad taste), so the drink would have to be sampled and the test done in a second container. The authors note esters can interfere, which might effectively be a problem in fruity mixed drinks with fruit esters and fermentation+distillation related esters. All in all, it is probably easier to throw away your drinks if you suspect they are spiked. If there is a serious suspicion, the drinks can also be given to the police for reliable investigation.
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In the end the smartphone is quite irrelevant - the detection happens through a color test that should also be visually clear as a purple color. Also, it is a bit impractical because a color test will ruin the drink (hydroxylamine is poisonous and has a strong bad taste), so the drink would have to be sampled and the test done in a second container. The authors note esters can interfere, which might effectively be a problem in fruity mixed drinks with fruit esters and fermentation+distillation related esters. All in all, it is probably easier to throw away your drinks if you suspect they are spiked. If there is a serious suspicion, the drinks can also be given to the police for reliable investigation.