Sonic
And the reason it would prevent it from being dated correctly is because the dughter product is a result of radioactive decay that has already occured,hence the date would be greater than the date we could thereby establish. So if we have a date set a 150,000,000 years and there is daughter products already present at 150,000,000 years ago then the rock is actually older by the amount of daughter product.If you are trying to establish that the rock is merely thousands of years old I believe this will not help your case.