The recent spate of police-bashing apparently has not made a long-term impact on Americans' opinions of police officers.  Lydia Saad has this report for Gallup with the above title:

After dipping to 48% in 2014 amid a national firestorm over police treatment of young black men, the rating Americans give the honesty and ethical standards of police has rebounded to 56%. This is more consistent with the 54% to 58% ratings Gallup found between 2010 and 2013.

Four in 10 nonwhites now rate the ethical standards of police as very high or high -- a sharp increase from the 23% who held this view in 2014. A steep drop in nonwhites' ratings of the police in 2014 was the sole cause of the profession's overall ratings dip last year. While nonwhites' attitudes have not rebounded to their pre-2014 levels, the slight increase in whites' positive views of the police this year, from 59% to 64%, coupled with the rise in nonwhites' ratings, pushes the overall percentage back to the "normal" range seen in recent years.

Gallup's long-term trend graph shows that the 56% number is higher than at any time in the first 23 years they asked the question, 1977-2000.  This opinion of the police started off a dismal 37% in 1977, climbed slowly with a couple setbacks until 2000, then spiked after 9/11.

Among the professions, nurses are still tops in the public's ethics esteem.  Lawyers don't do as badly as you might think, a tad below the middle.