Particularising Clarifying Elaborating Conjunctive Adjunct

in particular	when	they	are	committed	as part of a plan or policy or as part of a large-scale commission of such crimes
conjunctive Adjunct		Subject	Finite	Predicator	circumstantial Adjunct

How do we know that in particular doesn't modify when?

Because, like a conjunctive Adjunct, it can occur at different points in the clause:

• when, in particular, committed as part of a plan or policy or as part of a large-scale commission of such crimes
• when committed, in particular, as part of a plan or policy or as part of a large-scale commission of such crimes
• when committed as part of a plan or policy or as part of a large-scale commission of such crimes, in particular