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Context. The increasing interest in the recovery of historic data and the availability of new hardware resources is leading to projects to digitize photographic archives of astronomical observations. In addition to preservation, solar archives are digitized because the observations stored in such archives have the potential of providing unique information about solar magnetism, which can improve knowledge about long-term solar changes.

Disclosing chronic use of cannabis has always been a difficult task due to the fact that hair testing of THC alone is not conclusive of use and hair testing of THC-COOH require specific and sensitive instrumentation and laboratory skill, not available for many analytical laboratories. We hypothesized the presence of THC-COOH glucuronide in hair as possible alternative biomarker of repeated consumption of cannabis products.