I'd hope that in court, you'd be able to do tests to easily tell if the other 'writing' is from the same pen (and ink) or not.
It's certainly possible to write on a ticket with a 'harder' pen and not indent it. The problem is usually that the ink won't always flow, causing you to try again and again (which then breaks the orange covering and damages it). If the ink DOES flow, you don't have a problem.
For example, you could write on a date quite thin first time around. Then avoid the gates and later on use a thicker pen to write on a new date and go again. I am sure this is a relatively easy and common fraud (let me stress I am not saying that's the case here) because the thicker pen covers the previous information.
Because of this, it's no wonder that any RPI would be suspicious - hence the situation as it is today. However, I'm convinced that if you knew you were telling the truth and had a totally honest explanation, there would be some forensic experts able to prove your case (but goodness knows how expensive they'd be).
It's certainly possible to write on a ticket with a 'harder' pen and not indent it. The problem is usually that the ink won't always flow, causing you to try again and again (which then breaks the orange covering and damages it). If the ink DOES flow, you don't have a problem.
For example, you could write on a date quite thin first time around. Then avoid the gates and later on use a thicker pen to write on a new date and go again. I am sure this is a relatively easy and common fraud (let me stress I am not saying that's the case here) because the thicker pen covers the previous information.
Because of this, it's no wonder that any RPI would be suspicious - hence the situation as it is today. However, I'm convinced that if you knew you were telling the truth and had a totally honest explanation, there would be some forensic experts able to prove your case (but goodness knows how expensive they'd be).