Subsection (2) provides a power of arrest and detention for an immigration officer or member of the Garda Síochána in respect of a person refused leave to land. This is also in line with present law but with one important exception set out at paragraph (b) of the subsection. This paragraph excludes persons under 18 years of age from detention, an exclusion which has been a feature of immigration legislation enacted in recent years but which has not until now been a feature of immigration law generally.