"The purpose of Rule 602 is to prevent a witness from testifying to a fact of which he has no direct personal knowledge. State v. Cole, 147 N.C. App. 637, 645, 556 S.E.2d 666, 671 (2001), appeal dismissed and cert. denied, 356 N.C. 169, 568 S.E.2d 619 (2002).
"[P]'ersonal knowledge is not an absolute but may consist of what the witness thinks he knows from personal perception.' State v. Poag, 159 N.C. App. 312, 323, 583 S.E.2d 661, 669 (quoting State v. Cole, 147 N.C. App. 637, 645, 556 S.E.2d 666, 671 (2001)), appeal dismissed and disc. review denied, 357 N.C. 661, 590 S.E.2d 857 (2003).