Tips for cardiac echo in endocarditis: 

1. The most common location for a vegetation from IVDU is the tricuspid valve, you can best visualize this in the 4 chamber view. If you are having trouble obtaining the view, roll the patient onto their left side, this will improve the view! 
2. The mitral valve is the most common for other sources of endocarditis, which can also be seen in the 4 chamber, but sometimes better in the parasternal long axis
3. You are looking for a mobile mass on the valve, that seems to swing with the movement of the valve.  (There are other variants of making the diagnosis, but from a POCUS point of view this is what we are looking for). 
4. Sensitivity for TTE POCUS diagnosis of valve vegetations by this method is low at around 60%, but has over 95% specificity when a mobile mass on the valve is visualized. (LR+ 12)