Because the stakes of an error are so high, and because parchment and ink deteriorate and letters can crack or fade with age and handling, soferut includes not only the initial writing of new STaM but the ongoing work of checking existing scrolls, tefillin and mezuzot for damage or invalidating errors, traditionally recommended at set intervals and considered a serious religious obligation for a community's Torah scrolls in particular, since a scroll read from publicly must be kept in a certifiably valid state.
Modern technology has entered this checking process without displacing the fundamentally handwritten nature of the texts themselves: specialised scanning software is now used by many scribes and communities to assist in detecting letter irregularities that might otherwise be missed by eye, a tool scribes generally treat as an aid to, rather than a replacement for, the sofer's own trained judgement, since Jewish law's detailed requirements for what makes a letter valid or invalid still require expert human interpretation in ambiguous cases. Soferut remains an active, economically viable traditional trade today, sustained by the steady demand for new and replacement Torah scrolls, tefillin and mezuzot across Jewish communities worldwide, with training available through dedicated scribal schools in Israel and the diaspora that maintain the discipline's traditional apprenticeship character even as some of the surrounding verification technology has modernised.