Highly degraded citrus fruit juices collected during a quality control investigation of the Italian Ministry of Agricultural Alimentary and Forestry Policies (MIPAAF) were analyzed for verifying their technological history. The analyzed samples were fermented black fluids stated as degraded first strength juices, in order to justify communitarian aids. Polymethoxylated flavones (PMFs) detection of solid phase extracted (SPE) purified samples provided clean chromatograms and good separation of compounds of interest using high performance liquid chromatography coupled with diode array and mass spectrometry HPLC–PDA/ESI–MS/MS. Since the PMFs concentration is elevate in peel flavedo, it is directly correlated with juice extraction strength. Results showed that all analyzed samples presented a PMFs concentration ranging from two to eight times first strength juices, not respecting the minimum quality requirements of the European regulatory framework.