What type of search was conducted when marijuana was found in a toilet tank during an arrest?

The type of search conducted when marijuana was found in a toilet tank during an arrest is best categorized as a security search. This type of search is typically performed for the purpose of ensuring the safety of both the officers and the individual being arrested. In security searches, officers may look for weapons or contraband that could pose a threat during the detention process. By checking areas that might conceal harmful items, such as a toilet tank, law enforcement aims to mitigate any potential risks.

In this scenario, the discovery of marijuana highlights the search's role in ensuring safety while also uncovering evidence of criminal activity. Although other types of searches like consent or inventory searches could also discover evidence, the primary motivation in this case appears to be the safety and security aspect inherent in a security search during an arrest situation.