electronic implants like microchips can be easily read by the farmer, vet, inspector or whoever you wish, simply holding a hand held device against the sheep will give you their unique number, these hand held devices are easy to obtain, our's cost around £100 a couple of years ago, we wanted it to read conventional microchips in cats and dogs etc and the eid eartag chips. there is no reason if the change goes through that anyone will be able to buy these scanners and use them for their own stock. At the end of the day you need to catch up your sheep and then try and read the what could be chewed or missing ear tag to log medication, this way you don't even actual have to hold the animal, so much less stress all round. we have since seen these scanners cheaper, the reason we wanted to scan the eartag was because the numbers are often unreadable due to chewing. plus we have known of a situation where two sheep lost their tags, one had been given medication the other had not, both in this instance did not do to slaughter but if they had then it would have been possible that the medicated sheep could have ended up in the food chain. with the injectable id the farmer would have known with certainty which sheep had received the meds.