Federal Court of Justice of Germany
From 1983 - 1993, Breloer worked with expert witness Werner Koch, who developed the first method for tree appraisal that was accepted by the Federal Court of Justice of Germany. After his death in 1993 she continued their mutual work further using the "Koch method" which is recognized by jurisdiction as well as in practice. With Claus Mattheck, professor at the Karlsruhe Institute of Technology, she worked on tree failure analysis.