This topic started for reference. Contact details of the Dubai Police human rights department, for complaints about police treatment, and/or humanitarian cases, are:
Tel +971-4-6082629 - General Director of Department of Human Rights Care
Toll-free (in UAE) 800-404040 - users complaint section
Tel +971-4-6082305 or +971-4-6082304 - public complaints section
Each police station in Dubai is supposed to have a human rights office or department.