Updated from 11:42 a.m. EDT

Taser

(TASR)

fell in heavy volume Monday as nervousness grew ahead of a report about the stun-gun maker on

CBS News

. The network's Web site is teasing a story that will purportedly show a "fatal accident caught on tape" involving Taser. While no other details were released, the guns have been the subject of a spate of recent media skepticism lately, including a

New York Times

story last week suggesting that the company hasn't conducted meaningful safety testing. Taser traded down $4.29, or 14.5%, to $25.23 on volume of about 14 million shares.

Shares of

PetMed Express

(PETS) - Get Report

were among the

Nasdaq's

losers Monday after the company posted weaker-than-expected first-quarter earnings. The pet pharmacy company earned 8 cents a share on sales of $35.3 million. Analysts polled by Thomson First Call had expected it to earn 11 cents a share. A year ago it earned 6 cents a share on sales of $30.4 million. Shares of PetMed Express traded down $2.07, or 29.7%, to $4.90.

Alderwoods Group

(AWGI)

fell after it reported weaker-than-expected second-quarter earnings. Excluding items, the funeral home and cemetery operator earned 7 cents a share on sales of $164.1 million. Analysts had expected it to earn 11 cents a share. A year ago it reported a loss of 5 cents a share on sales of $166.5 million. Shares of Alderwoods Group traded down $1.75, or 15.2%, to $9.75.

Shares of

Tyson Foods

(TSN) - Get Report

slipped after the company reported strong third-quarter financial results but warned that full-year earnings would fall short of expectations. Excluding one-time items, the meat company earned 42 cents a share on sales of $6.6 billion. Analysts had expected it to earn 36 cents a share on sales of $6.53 billion. Looking ahead, it now expects to report a profit of $1.20 to $1.30 a share for the full year. Analysts, however, were looking for it to earn $1.41 a share. Shares of Tyson Foods traded down $1.47, or 7.4%, to $18.48.

Oakley

(OO)

rose after it said that its CEO would buy 2 million shares of Oakley stock in the open market. Jim Jannard said that he believes Oakley is "undervalued and represents an attractive investment at current market prices." Jannard will not buy stock when Oakley is in the open market repurchasing shares. Jannard owns about 42.7 million shares. Shares of Oakley traded up 64 cents, or 6.5%, to $10.49.

Shares of

Consol Energy

(CNX) - Get Report

fell after the company reported strong second-quarter results but warned that its third-quarter results would fall short of expectations. The coal producer earned 29 cents a share on sales of $674.6 million. Analysts had expected it to earn 22 cents a share on sales of $618.5 million. Looking ahead, it now expects to earn 5 cents to 10 cents a share during the third quarter. Analysts, however, were looking for it to earn 30 cents a share. Shares of Consol Energy traded down $3.83, or 10.7%, to $31.88.

NYSE volume leaders included

Lucent

(LU)

, down 10 cents to $3.15;

Nortel Networks

(NT)

, down 12 cents to $4.07;

Mylan Labs

(MYL) - Get Report

, down $3 to $15.51;

Pfizer

(PFE) - Get Report

, down 56 cents to $31.74; and

General Electric

(GE) - Get Report

, down 21 cents to $32.31.

Nasdaq

volume leaders included

Intel

(INTC) - Get Report

, up 30 cents to $22.97;

Microsoft

(MSFT) - Get Report

, up 63 cents to $28.66;

Cisco

(CSCO) - Get Report

, down 39 cents to $20.54;

Oracle

(ORCL) - Get Report

, down 2 cents to $10.08; and

JDS Uniphase

(JDSU)

, down 2 cents to $3.01.