Classmates.com was accused of piggybacking and post-transaction marketing. Piggybacking data is a bit different from Sliding Protocol used in the OSI model. For example, monitoring MPLS LSPs involves piggybacking session establishment on LSP-Ping packets. Piggybacking may also be a breach of the Computer Misuse Act 1990. In episode 11 she is seen carrying Melt's rods and piggybacking an injured Utu. Such users are often unaware that they are piggybacking, and the subscriber has not noticed. Views on the ethics of piggybacking vary widely. An Illinois man was arrested in January 2006 for piggybacking on a Wi-Fi network. Piggybacking can be regarded as one of the simpler forms of social engineering. They also find drugs which Lorcan is piggybacking on the booze run. Three rules govern the piggybacking data transfer.