Which legal issue complicates the use of aeds to save lives

From what I know there could be a few reasons. 
1. Maintenance
2. Training for the use of an AED
3. Cost

Unlike  ct scans, which use x-rays,  mri scans  use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures.  differences between  normal and abnormal tissue is often clearer on an  mri  image than a  ct.you can see more with a mri scan. for example on an mri you can see internal bleeding.

  i think it would be the wrongg undervides