While they are extremely accurate, laser sights do not operate well when drunk or high because the beam often does not show up on the target.
1	While	while	SCONJ	IN	_	5	mark	5:mark	_
2	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	5	nsubj	5:nsubj	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	cop	5:cop	_
4	extremely	extremely	ADV	RB	_	5	advmod	5:advmod	_
5	accurate	accurate	ADJ	JJ	Degree=Pos	11	advcl	11:advcl:while	SpaceAfter=No
6	,	,	PUNCT	,	_	11	punct	11:punct	_
7	laser	laser	NOUN	NN	Number=Sing	8	compound	8:compound	_
8	sights	sight	NOUN	NNS	Number=Plur	11	nsubj	11:nsubj	_
9	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	11	aux	11:aux	_
10	not	not	PART	RB	_	11	advmod	11:advmod	_
11	operate	operate	VERB	VB	VerbForm=Inf	0	root	0:root	_
12	well	well	ADV	RB	Degree=Pos	11	advmod	11:advmod	_
13	when	when	ADV	WRB	PronType=Int	14	advmod	14:advmod	_
14	drunk	drunk	ADJ	JJ	Degree=Pos	11	advcl	11:advcl:when	_
15	or	or	CCONJ	CC	_	16	cc	16:cc	_
16	high	high	ADJ	JJ	Degree=Pos	14	conj	11:advcl:when|14:conj:or	_
17	because	because	SCONJ	IN	_	23	mark	23:mark	_
18	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	_
19	beam	beam	NOUN	NN	Number=Sing	23	nsubj	23:nsubj	_
20	often	often	ADV	RB	_	23	advmod	23:advmod	_
21	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	23	aux	23:aux	_
22	not	not	PART	RB	_	23	advmod	23:advmod	_
23	show	show	VERB	VB	VerbForm=Inf	11	advcl	11:advcl:because	_
24	up	up	ADP	RP	_	23	compound:prt	23:compound:prt	_
25	on	on	ADP	IN	_	27	case	27:case	_
26	the	the	DET	DT	Definite=Def|PronType=Art	27	det	27:det	_
27	target	target	NOUN	NN	Number=Sing	23	obl	23:obl:on	SpaceAfter=No
28	.	.	PUNCT	.	_	11	punct	11:punct	_
