Some Dutch coffee shops, which sell marijuana in small quantities for personal use, are introducing fingerprinting technology to check the age of customers.

The shops are not allowed to sell to anyone under the age of 18. Coffee shops currently require photographic ID for proof of age.

The first coffee shops to use turnstiles with built-in fingerprint sensors are Inpetto in Rotterdam, Birdy in Haarlem, and 't Rotterdammertje in Doetinchem in the east of the country. Customers must first register with the shops, but personal details will not be stored.

The technology has been developed by FingerIdent, a company owned by Gerrie Mansur, one of the members of legendary Dutch hacking group Hit2000. According to Mansur, the system can match 35,000 fingerprints in less than a second. ®