Initially, I thought of creating a glass that can detect and alarm you to date rape drugs. My research on that idea led me to Drink Savvy, I then considered a straw that can do the same thing and found this, it is worth noting that both of those are still good ideas and neither of them seems to have ever made it to the production stage. The drug-detecting glass' website has been repurposed and there has been no news on the drug-detecting straws since 2017. So those are still opportunities.
During my research I also found Sip Chip who manufacture small and discreet drug tests. They seem to be doing well, but their products are single-use and still needs to be brought along, meaning there is a chance that you might find yourself in a situation where you suspect your drink might have been spiked but you do not have one with you to test.
My idea is to combine these three innovations to create a pendant on a necklace or wristband or even a ring that contains everything you need to test your drink for drugs.
The ideal product would be reusable, allowing you to test multiple drinks throughout the night, but seeing as the three examples I have given all rely on single-use tests, the idea is to combine the methods used by Drink Savvy and Sip Chip, and create thin, compact, test sheets that could be dispensed from a locket on a necklace or from under a ring.
My thinking behind using jewellery for these tests is simply that it is discreet and always on your person for quick access at any time.