The only thing you can do is buy form a trusted source and ask for paperwork.
'Paperwork' normally involves a picture of the snake in question along with information (and a guarantee) regarding the genetics (ie what the parents are etc)
The only thing you can do is avoid unknown sellers and dubiously cheap animals.
In your example of het albinos you would KNOW your snakes are het albino because a source you trust says at least one parent was an albino.
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