In a Section 1983 action alleging improper search, a claim at trial that the tip was hearsay does not properly preserve a claim on appeal that the confidential informant might not have existed at all.
http://media.ca7.uscourts.gov/cgi-bin/rssExec.pl?Submit=Display&Path=Y2018/D06-06/C:17-2073:J:Gilbert:aut:T:fnOp:N:2166644:S:0
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.