No as such there is no limitation available for using finger technology. only some of the limitations are depends upon quality to use finger. With fingerprint algorithms available with products customer can make use of quality checking techniques which are available with fingerprint readers. If quality of finger is too bad using lowering security levels such limitations can be minimized, but depending upon the security levels quality of finger can be checked. During cold seasons if fingers are having some scratches then chances are there that sometimes finger wont get recognized, therefore during such conditions it is recommended to re register such fingers which has scratches or burn marks. But over worldwide 99% accuracy can be measured for security using fingerprint techniques.