Rules Analysis
WFDF 2017 Rules
12. Receivers and Positioning
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12.3.
3
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The following are out-of-bounds turnovers, and no catch is deemed to have occurred:

Note:
If an opponent believes an offensive player has caught the disc out-of-bounds they should make a call immediately by saying "Out-of-bounds" or "Out" for short. "Check feet" is a not a call and this call does not stop play.
If it is unclear if the player was out-of-bounds then play should stop as the players with best perspective discuss the call. Players may ask for perspective from people on the side-line, however it is still up to the players involved to make the final call.
If the call is contested the disc shall be returned to the previous thrower.

Extra:
For games played on unlined fields the receiver should be given the benefit of the doubt for close "Out-of-bounds" calls.

This rule was changed from the previous rulebook version
This rule was added from the previous rulebook version
This rule has updates in the next rulebook version
12.3.2.

after catching the disc, an offensive receiver's first contact is out-of-bounds while still in possession of the disc.

12.3.2.
Children
12.3.2.
Associates
WFDF 2021-24 Rules
11.4.2.

after catching the disc while airborne, an offensive receiver’s first contact is out-of-bounds while still in contact with the disc.