[IndyTiger]

One option is to use a pen with blue or black non-erasable gel ink, as gel ink soaks into paper and is more difficult to remove than ballpoint-pen ink. I use a blue Uniball 207 Gel Pen for the rare occasion when I need to write a check. Maybe not totally foolproof, but it does give me some peace of mind.

[OrioleFan]

Thanks. I’ll give it a shot.