Looks like Wyoming has just made a change in the last month.
http://legisweb.state.wy.us/2015/bills/SF0108.pdf
23-6-109. Search with or without warrant;
12 confiscation and disposition of wildlife.
13
14 (d) No person authorized to enforce the provisions of
15 this act as provided in W.S. 23-6-101, in the course of
2015 STATE OF WYOMING 15LSO-0487
2 SF0108
1 performing their ordinary duties, may enter any private
2 land without the permission of the landowner or the lessee.
3 However, a person authorized to enforce the provision of
4 this act may enter any private land without permission:
5
6 (i) If reasonable suspicion or probable cause
7 exists that a violation of a law that the person is
8 authorized to enforce has been, is being, or is about to be
9 committed;
10
11 (ii) To investigate a report of illegal hunting,
12 fishing or trapping activity;
13
14 (iii) To dispatch crippled or distressed
15 wildlife; or
16
17 (iv) To respond to emergency situations,
18 accidents or other threats to public safety.
Luckily, SF 108 did not pass the legislature.
http://legisweb.state.wy.us/2015/Digest/SF0108.pdf