In which scenario would you definitely call for backup?

The scenario involving engaging with suspects in volatile situations is the most appropriate context to call for backup. In these situations, there are higher risks of confrontation, potential violence, or unpredictable behavior from individuals involved. Having additional officers present ensures that there are sufficient resources to manage the situation safely, protect all parties involved, and maintain control over the environment.

In contrast, addressing minor traffic violations typically involves routine enforcement where backup may not be necessary. Interacting with the public in a calm setting and handling routine paperwork also do not present immediate threats or challenging circumstances that would warrant the need for additional assistance. Clearly, the priority in potentially dangerous or unpredictable situations is ensuring officer safety and effectively managing risks, making it essential to call for backup when engaging with volatile suspects.