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Critical section for shear in wood beams

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NDS Commentary section 3.4.3.1(a) states that this has been a provision of the
NDS since the first edition (1944). It assumes such loads are carried directly
to the support by diagonal compression through the depth of the bending member.

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From: Suresh <suresh(--nospam--at)ynn.com>
To: seaint(--nospam--at)seaint.org
Subject: Critical section for shear in wood beams 

ACI requires that critical shear stress be calculated at the face of
support rather than a distance  'd'  from the face of support when a
concentrated load occurs within a distance 'd' from the face of support.
But UBC 94 chapter 23 without any "Ifs" or "Buts" allows designers to
neglect ANY loads within a distance 'd' from the support. Is wood
different than other materials? Anybody know any other relevant code
provisions?