mid-15c. (implied in suspected), from suspect (adj.) and in part from French suspecter or directly from Latin suspectare "to mistrust," frequentative of suspicere. Related: Suspecting.
"Suspicion" words in other Indo-European languages also tend to be words for "think" or "look" with prefixes meaning "under, behind;" such as Greek hypopsia (hypo "under," opsis "sight"), hyponoia (noein "to think"); Lettish aizduomas (aiz "behind," duomat "think"); Russian podozrenie (Slavic podu "under," Old Church Slavonic zireti "see, look"); Dutch achterdocht (achter "behind," denken "to think").
1530s, "to have doubts (of the reality of), to suspect, to regard (the truth or reality of) with suspicion," from mis- (1) "badly, wrongly" + doubt (v.). Meaning "to fear or suspect (the existence of something evil) is from 1560s. Intransitive sense of "entertain doubt" is from 1630s. Related: Misdoubted; misdoubting. As a noun, "irresolution," 1590s.
in reference to criminal suspects' arrest rights in U.S., 1967, from the name of rape and robbery suspect Ernesto Miranda (1941-1976) and his Fifth Amendment cases, ruled on by U.S. Supreme Court June 13, 1966, under the heading Ernesto A. Miranda v. the State of Arizona.