Tapes of various types may be used inside and outside of the mailed item because the bomber wants to ensure the container will survive transit without being damaged. Whether ante-blast, post-blast, or post-disruption by water jet techniques, there is a wealth of evidence in recovered letter and parcel bombs. Components of letter and parcel bombs are discussed, as well as their wrapping and labeling and other elements of evidential value. The police response to these bombs and the effects of blast on evidence are considered. Particular attention is paid to water jet disrupted evidence, recoverable evidence in an undated or low order detonation bomb with most packaging intact, detonated and disrupted mail bombs, the prosecution of crimes involving explosives, and bomber signatures. Canadian legislation that covers the sending or delivering of explosives is noted. 5 references and 42 photographs