yeah shaq u are rite about that carfax things. i bought one car from dealer and i check its vin number. That dealer gave me current carfax report. But in that report the latest accident was missing. when i tried to sell my car after 7 month (after i got new title after) and the new  possible buyer check the carfax, this time there was latest accident report.i was not in any accident. but the accident report says it was major. it ripped out side of car and few fronts part like the radiator,front frame but the title was clean(no lemon,no salvage,no rebuilt nothing).
 it happens so dont rely on carfax only, do taste drive, take it to mechanic. they will charge $50-$60 in most of the case also depends where u are.