When a family shares one personal breathalyzer, a person coming home from a company dinner and a person about to leave for work the next day may test one after the other on the same device. As results pile up in time order on the screen or in a smartphone app, the numbers can stand out before who tested and when. If you compare a family member's lower reading with your own state and use it as a basis for deciding whether to drive, the meaning of the record changes.
A personal breathalyzer is a self-check tool for looking at your state at the time based on your breath. The result is not a certificate that allows you to drive, and one person's result is not a standard that applies to someone else. When a family uses a shared device, rather than comparing who had the lower reading, you need a way to record each result's tester, time, and display status, and the travel choice made afterward, separately.
Do not turn numbers into a baseline among family members
If you put two people's results side by side and conclude "I'm lower than this person, so I'm fine," a single self-check result turns into something like a family standard for allowing driving. Nor can you calculate when a particular person can drive from body size, sex, or usual drinking experience alone. A family member's reading is not information that explains or supplements yours.
A different result also does not need to lead straight to conclusions about health or a device fault. First look separately at who took that test, the actual date and time, and what unit and error indication appeared on the screen. A number missing this information is closer to a record of unclear origin than something to compare.
In shared records, mark whose result it is
Leaving the minimum information that keeps results from being misread later matters more than writing down a lot of personal details. Instead of full names, use a short marker each person chooses, and right after seeing the result, write down the date, time, display unit, reading, and whether there was an error. If you did not drive, you can also record the way you actually chose to travel.
| What to record separately | How to write it | Why it is needed |
|---|---|---|
| Who tested | A short marker only that person recognizes | So you do not read another family member's result as your own |
| When the test was taken | The date and time confirmed on the screen or in the app | So the order of records is not rearranged from memory |
| Result shown on screen | Display unit, reading, error indication | So results in different units or with errors are not treated as the same value |
| Travel choice afterward | Public transport actually used, traveling with someone, etc. | To review travel plans instead of comparing numbers |
It is better not to put guesses in the record, such as "we used the same device in the same house, so the test preparation must have been the same." Only by recording facts actually confirmed can you tell memory from fact when looking at the records later. Matters of device condition, such as testing procedure, device storage, and calibration status, are questions to check separately under maintenance. The focus here is on not mixing up whose test result is whose.
In an app list, check the tester before the account
A breathalyzer that connects to a smartphone is convenient because you can see the history on one screen, but you cannot assume that records in a shared account are automatically separated by person. The official product information for DATECH's AF-40BT describes smartphone connectivity, a dual mode for standalone and app use, and a test result storage feature. However, whether the app can separate multiple users' results must be confirmed through the guidance and settings of the app you currently use.
When previous results appear in a shared app, do not decide the most recent number is your result just by looking at it. You need to check the date, time, and the user marker you left first. If a per-person separation feature has not been confirmed, you can consider having each person keep the same marker in a separate memo, or narrowing who views the app records together.
Test results can reveal personal lifestyle information. So before posting a screen in a family group chat or forwarding it to someone else, it is best to check whether the person who took that test agreed to share it. Separating records is not a procedure for monitoring people. It is a safeguard against pulling someone else's result into your own decision.
Do not force mixed records onto a person
As a hypothetical example, suppose two family members used the same device in the evening and the next morning, and the app kept only results in time order. What to look at first is the date and time of each record, any notes written at the time, and the order in which you can confirm the two people actually used the device. Do not assign the tester of a particular row from memory alone, such as "the low reading in the morning must be mine."
When interpreting, separate records with verifiable clues from those without. A result whose date and note match can be filed as that person's record, but a result without enough evidence should be left as "tester unconfirmed." The moment you fill an unknown field with a family member's value, the record stops being information that preserves facts and becomes information with guesses added.
A possible action is to agree that from the next test on, the user marker and time are recorded immediately, and the travel method is noted briefly if needed. The completion criterion is not finding an owner for every past record. It is a state in which unconfirmed results are not used as the basis for anyone's driving decision, and there is no confusion about who tested in later records.
Family help lies in travel plans, not in finding a lower reading
When a family member's result comes out differently, it fits the purpose of the record better to arrange a way for that person to travel without driving than to keep comparing to see who is lower. Deciding in advance on options that are actually available, such as public transport, traveling with someone, or a designated driver service, reduces the pressure to reach a conclusion by comparison when the numbers are unclear.
When you look back over the records, instead of looking for the lowest reading or a ranking, you can check on which days no alternative way to travel was ready. If your self-test reading and how you feel do not agree, or you feel the result is hard to trust, the conservative decision is to change your travel plan rather than justify driving by comparing with a family member's reading.
A good family record is not one that finds a lower number. It is one that keeps track of whose result each is and when it was taken, and records what safe travel choice was made afterward. Records kept this way become not a family comparison chart but everyday check material that reduces the same confusion next time.
※ Self-check results from our products are provided as reference information only. Actual enforcement standards and testing methods may differ by agency and equipment, so self-check results may differ from enforcement results, and the company accepts no responsibility for enforcement results.
