In 2013, which police department hosted the smile national conference for police officers to discuss ways of using social media to their advantage?

The answer is "Omaha PD".

The SMILE Conference is the main gathering dedicated to online networking and use of social media, the Web and Law Implementation activities. The SMILE Conference has spearheaded the appropriation of online networking by law implementation offices over the world for public outreach, crime counteractive action, and forensics. The initiative of social media conference for police initially permeated at LAwS Correspondences in late 2008.  

it is due to the halo effect as the impression of the boy created earlier.on the mind of the principle affected his decision

you should try adrenaline. it kicks in in situations like this.