An automated system for continual transdermal extraction of analytes present in a biological system is described. The system optionally uses reverse iontophoresis to carry out the continual transdermal extraction of the analytes. The present invention describes quality control test kits, and methods...http://www.google.de/patents/US6391643?utm_source=gb-gplus-sharePatent US6391643 - Kit and method for quality control testing of an iontophoretic sampling system
