Alaska R. Evid. 901

The requirement of authentication or identification as a

condition precedent to admissibility is satisfied by evidence

sufficient to support a finding that the matter in question is

what its proponent claims, except as provided in paragraphs (a)

and (b) below:

(a) Whenever the prosecution in a criminal trial offers (1)

real evidence which is of such a nature as not to be readily

identifiable, or as to be susceptible to adulteration,

contamination, modification, tampering, or other changes in

form attributable to accident, carelessness, error or fraud, or (2)

testimony describing real evidence of the type set forth in (1) if

the information on which the description is based was acquired

while the evidence was in the custody or control of the

prosecution, the prosecution must first demonstrate as a matter

of reasonable certainty that the evidence is at the time of trial

or was at the time it was observed properly identified and free

of the possible taints identified by this paragraph.

(b) In any case in which real evidence of the kind

described in paragraph (a) of this rule is offered, the court may

require additional proof before deciding whether to admit or

exclude evidence under Rule 403.