 Callinan's tenure as Garda Commissioner was rough, with multiple scandals uncovering during his time at the helm of the force.Over 100 Garda stations were closed during Callinan's 4 year leadership, for which he received harsh criticism for.Reports from the Garda Síochána Ombudsman Commission, also known as GSOC, criticized the handling of Kieran Boylan, an informant to the Gardai about various drug trafficking cartels in Ireland.