In the State of Maryland in the US, an MP proposed a Bill to criminalise piggybacking with Wi-Fi. See PDF document: http://mlis.state.md.us/2008rs/bills/hb/hb1377f.pdf
"FOR the purpose of prohibiting a person from intentionally, willfully, and without
authorization accessing, attempting to access, causing to be accessed, or
exceeding the person’s authorized access to wireless Internet service with a
certain knowledge; applying certain penalties; and generally relating to
unauthorized access to computers and related material."
Wonder if any similar proposal would be of any use? CMA 1990 section 1 cirminalised unauthorised access to computer; can the interpretation be extended to Wi-Fi (which after all requires access to computers?)
See "A Public Official Actually Shows Common Sense in Wireless 'Piggybacking' Debate" (21 March 2008) http://www.techdirt.com/articles/20080320/172759602.shtml