The department last week wrote to the institute's director of climate change policy, Tim Wilson, and asked that he stop submitting requests so it could deal with the backlog..... If the volume of applications continued the department would consider whether dealing with Mr Wilson's requests was an unreasonable diversion of resources - a step that could lead to him being considered a vexatious applicant. It is believed Mr Wilson submitted about 440 information requests on one day in late July and more than 140 on one day last week.
(Update: On a related issue the Queensland Commissioner recently published a research paper on repeat applicants for external review, defined as applicants who make a relatively large number of applications, submit them in short bursts of activity and engage in ‘unreasonable conduct’. The research examined external reviews finalised under the Freedom of Information Act 1992, the Right to Information Act 2009 or the Information Privacy Act 2009 between 1 July 2006 and 21 February 2011. Excluding journalists and parliamentarians, nine who made 10 or more applications included one with 87 involving 15 government agencies/ministers and others with 54 and 45 applications. "Overall, the result is that repeat applicants have a detrimental impact on the equitable access of other persons to external review of access and amendment decisions in Queensland.")
The Tasmanian RTI act (s20) goes further simply authorising an agency or minister to refuse an application on the basis it is a vexatious application.
(Further Update: The Australian editorialises "there can never be anything vexatious about exercising the public's right to know. No ifs, no buts." Others might suggest that high minded principle needs to be considered in context, in light of what is requested-and that size does matter.