I wouldn't trust the accuracy of that device to begin with. I also wouldn't install the App on my phone. Did you read the permissions you gave it when you installed it? Why does it need your GPS location? There is absolutely no reason for that App to access your GPS location. None. Zero.
I'm in a legal state and I would never agree to share the information they're gathering.
From the Google Play Store:
This app has access to
Location
- precise location (GPS and network-based)
- approximate location (network-based)
According to their privacy policy on their website:
"Information Received from Your Use of Our Services"
EMT device information
Your device, app, and web site, collects data, including but not limited to, device serial number (ID), raw sensor measurement information, calculated results, device health, battery levels, temperature, time, date,
location, OS, software/firmware version, and other metadata. The data collected varies depending on device or service you use.
Location may be obtained directly through GPS, Wifi, cell towers, other device sensors, or derived from IP address. When your device synchronizes with EMT servers, data recorded on your device is transferred from your device to the EMT servers.
EMT may preserve or disclose information about you to comply with a law, regulation, legal process, or governmental request; to assert legal rights or defend against legal claims; or to prevent, detect, or investigate illegal activity, fraud, abuse, violations of our terms, or threats to the security of the Services or the physical safety of any person.
You're giving up all that information just to use some scammy pocket THC/CBD tester that isn't even accurate if it works at all.