The offences include measures targeting violent and organised crime.
A range of new criminal offences, as well as tougher sentences for existing offences, come into effect from today.
The offences include measures targeting violent and organised crime, violence against Gardaí and other emergency service workers, and measures to support victims and punish perpetrators of domestic, sexual and gender-based violence.
As of today, the maximum sentence for conspiracy to murder increases from the current penalty of ten years to life imprisonment.
The maximum sentence for assaulting or threatening to assault a Garda or other on duty emergency workers has increased from 7 to 12 years.
Justice Minister Helen McEntee says ensuring the safety of Gardaí and all other frontline workers has been one of her main priorities.
A new standalone offence of stalking, with a maximum sentence of up to ten years, has also been created and is now in effect.
The Justice Minister also says the changes mark a milestone in the Government's efforts to build stronger, safer communities.
Anne Clarke of the Offaly Domestic Violence Support Service says the low threshold for stalking means it needs to only happen once:
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