Any passive security system can by bypassed given enough time, effort, and money. The object is just to make the cost of bypassing security higher than the gain, and unless you're doing high-stakes research or DoD work, a simple fingerprint / password system should be sufficient. Possible improvements might include:

Finger temperature scan and/or blood gas reading (former might be faked by warming gelatin, latter is much harder to)

Automatic digital photograph of the finger as it comes close to the scanner (if it looks odd, it's gelatin or has been cut off)

Weight plate (place feet here, test for weigh within x pounds of last scan with same fingerprint and pass)

Retinal scan (though if you have one, why do fingerprint?)

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