Why Some Ginger Beer Brands Contain Trace Amounts Of Alcohol - Tasting Table
Briefly

Ginger beer, while often confused with ginger ale, is brewed and fermented, resulting in a stronger ginger flavor and a potential trace of alcohol due to its production process.
Unlike ginger ale, which is made from carbonated water and ginger extract, ginger beer involves boiling actual ginger with water, followed by fermentation with yeast.
Producers can maintain low or zero alcohol levels in ginger beer by controlling sugar quantities, fermentation temperatures, and using low-alcohol yeast strains, offering variety in flavor.
Ginger beer may contain a small amount of alcohol, but many brands limit this through fermentation control, resulting in a drink that is around 0.5% alcohol.
Read at Tasting Table
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